(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.chai = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
    module.exports = require('./lib/chai');

},{"./lib/chai":2}],2:[function(require,module,exports){
    /*!
     * chai
     * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    var used = []
        , exports = module.exports = {};

    /*!
     * Chai version
     */

    exports.version = '3.5.0';

    /*!
     * Assertion Error
     */

    exports.AssertionError = require('assertion-error');

    /*!
     * Utils for plugins (not exported)
     */

    var util = require('./chai/utils');

    /**
     * # .use(function)
     *
     * Provides a way to extend the internals of Chai
     *
     * @param {Function}
     * @returns {this} for chaining
     * @api public
     */

    exports.use = function (fn) {
        if (!~used.indexOf(fn)) {
            fn(this, util);
            used.push(fn);
        }

        return this;
    };

    /*!
     * Utility Functions
     */

    exports.util = util;

    /*!
     * Configuration
     */

    var config = require('./chai/config');
    exports.config = config;

    /*!
     * Primary `Assertion` prototype
     */

    var assertion = require('./chai/assertion');
    exports.use(assertion);

    /*!
     * Core Assertions
     */

    var core = require('./chai/core/assertions');
    exports.use(core);

    /*!
     * Expect interface
     */

    var expect = require('./chai/interface/expect');
    exports.use(expect);

    /*!
     * Should interface
     */

    var should = require('./chai/interface/should');
    exports.use(should);

    /*!
     * Assert interface
     */

    var assert = require('./chai/interface/assert');
    exports.use(assert);

},{"./chai/assertion":3,"./chai/config":4,"./chai/core/assertions":5,"./chai/interface/assert":6,"./chai/interface/expect":7,"./chai/interface/should":8,"./chai/utils":22,"assertion-error":30}],3:[function(require,module,exports){
    /*!
     * chai
     * http://chaijs.com
     * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    var config = require('./config');

    module.exports = function (_chai, util) {
        /*!
         * Module dependencies.
         */

        var AssertionError = _chai.AssertionError
            , flag = util.flag;

        /*!
         * Module export.
         */

        _chai.Assertion = Assertion;

        /*!
         * Assertion Constructor
         *
         * Creates object for chaining.
         *
         * @api private
         */

        function Assertion (obj, msg, stack) {
            flag(this, 'ssfi', stack || arguments.callee);
            flag(this, 'object', obj);
            flag(this, 'message', msg);
        }

        Object.defineProperty(Assertion, 'includeStack', {
            get: function() {
                console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
                return config.includeStack;
            },
            set: function(value) {
                console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
                config.includeStack = value;
            }
        });

        Object.defineProperty(Assertion, 'showDiff', {
            get: function() {
                console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
                return config.showDiff;
            },
            set: function(value) {
                console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
                config.showDiff = value;
            }
        });

        Assertion.addProperty = function (name, fn) {
            util.addProperty(this.prototype, name, fn);
        };

        Assertion.addMethod = function (name, fn) {
            util.addMethod(this.prototype, name, fn);
        };

        Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
            util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
        };

        Assertion.overwriteProperty = function (name, fn) {
            util.overwriteProperty(this.prototype, name, fn);
        };

        Assertion.overwriteMethod = function (name, fn) {
            util.overwriteMethod(this.prototype, name, fn);
        };

        Assertion.overwriteChainableMethod = function (name, fn, chainingBehavior) {
            util.overwriteChainableMethod(this.prototype, name, fn, chainingBehavior);
        };

        /**
         * ### .assert(expression, message, negateMessage, expected, actual, showDiff)
         *
         * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
         *
         * @name assert
         * @param {Philosophical} expression to be tested
         * @param {String|Function} message or function that returns message to display if expression fails
         * @param {String|Function} negatedMessage or function that returns negatedMessage to display if negated expression fails
         * @param {Mixed} expected value (remember to check for negation)
         * @param {Mixed} actual (optional) will default to `this.obj`
         * @param {Boolean} showDiff (optional) when set to `true`, assert will display a diff in addition to the message if expression fails
         * @api private
         */

        Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual, showDiff) {
            var ok = util.test(this, arguments);
            if (true !== showDiff) showDiff = false;
            if (true !== config.showDiff) showDiff = false;

            if (!ok) {
                var msg = util.getMessage(this, arguments)
                    , actual = util.getActual(this, arguments);
                throw new AssertionError(msg, {
                    actual: actual
                    , expected: expected
                    , showDiff: showDiff
                }, (config.includeStack) ? this.assert : flag(this, 'ssfi'));
            }
        };

        /*!
         * ### ._obj
         *
         * Quick reference to stored `actual` value for plugin developers.
         *
         * @api private
         */

        Object.defineProperty(Assertion.prototype, '_obj',
            { get: function () {
                return flag(this, 'object');
            }
                , set: function (val) {
                flag(this, 'object', val);
            }
            });
    };

},{"./config":4}],4:[function(require,module,exports){
    module.exports = {

        /**
         * ### config.includeStack
         *
         * User configurable property, influences whether stack trace
         * is included in Assertion error message. Default of false
         * suppresses stack trace in the error message.
         *
         *     chai.config.includeStack = true;  // enable stack on error
         *
         * @param {Boolean}
         * @api public
         */

        includeStack: false,

        /**
         * ### config.showDiff
         *
         * User configurable property, influences whether or not
         * the `showDiff` flag should be included in the thrown
         * AssertionErrors. `false` will always be `false`; `true`
         * will be true when the assertion has requested a diff
         * be shown.
         *
         * @param {Boolean}
         * @api public
         */

        showDiff: true,

        /**
         * ### config.truncateThreshold
         *
         * User configurable property, sets length threshold for actual and
         * expected values in assertion errors. If this threshold is exceeded, for
         * example for large data structures, the value is replaced with something
         * like `[ Array(3) ]` or `{ Object (prop1, prop2) }`.
         *
         * Set it to zero if you want to disable truncating altogether.
         *
         * This is especially userful when doing assertions on arrays: having this
         * set to a reasonable large value makes the failure messages readily
         * inspectable.
         *
         *     chai.config.truncateThreshold = 0;  // disable truncating
         *
         * @param {Number}
         * @api public
         */

        truncateThreshold: 40

    };

},{}],5:[function(require,module,exports){
    /*!
     * chai
     * http://chaijs.com
     * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    module.exports = function (chai, _) {
        var Assertion = chai.Assertion
            , toString = Object.prototype.toString
            , flag = _.flag;

        /**
         * ### Language Chains
         *
         * The following are provided as chainable getters to
         * improve the readability of your assertions. They
         * do not provide testing capabilities unless they
         * have been overwritten by a plugin.
         *
         * **Chains**
         *
         * - to
         * - be
         * - been
         * - is
         * - that
         * - which
         * - and
         * - has
         * - have
         * - with
         * - at
         * - of
         * - same
         *
         * @name language chains
         * @namespace BDD
         * @api public
         */

        [ 'to', 'be', 'been'
            , 'is', 'and', 'has', 'have'
            , 'with', 'that', 'which', 'at'
            , 'of', 'same' ].forEach(function (chain) {
            Assertion.addProperty(chain, function () {
                return this;
            });
        });

        /**
         * ### .not
         *
         * Negates any of assertions following in the chain.
         *
         *     expect(foo).to.not.equal('bar');
         *     expect(goodFn).to.not.throw(Error);
         *     expect({ foo: 'baz' }).to.have.property('foo')
         *       .and.not.equal('bar');
         *
         * @name not
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('not', function () {
            flag(this, 'negate', true);
        });

        /**
         * ### .deep
         *
         * Sets the `deep` flag, later used by the `equal` and
         * `property` assertions.
         *
         *     expect(foo).to.deep.equal({ bar: 'baz' });
         *     expect({ foo: { bar: { baz: 'quux' } } })
         *       .to.have.deep.property('foo.bar.baz', 'quux');
         *
         * `.deep.property` special characters can be escaped
         * by adding two slashes before the `.` or `[]`.
         *
         *     var deepCss = { '.link': { '[target]': 42 }};
         *     expect(deepCss).to.have.deep.property('\\.link.\\[target\\]', 42);
         *
         * @name deep
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('deep', function () {
            flag(this, 'deep', true);
        });

        /**
         * ### .any
         *
         * Sets the `any` flag, (opposite of the `all` flag)
         * later used in the `keys` assertion.
         *
         *     expect(foo).to.have.any.keys('bar', 'baz');
         *
         * @name any
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('any', function () {
            flag(this, 'any', true);
            flag(this, 'all', false)
        });


        /**
         * ### .all
         *
         * Sets the `all` flag (opposite of the `any` flag)
         * later used by the `keys` assertion.
         *
         *     expect(foo).to.have.all.keys('bar', 'baz');
         *
         * @name all
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('all', function () {
            flag(this, 'all', true);
            flag(this, 'any', false);
        });

        /**
         * ### .a(type)
         *
         * The `a` and `an` assertions are aliases that can be
         * used either as language chains or to assert a value's
         * type.
         *
         *     // typeof
         *     expect('test').to.be.a('string');
         *     expect({ foo: 'bar' }).to.be.an('object');
         *     expect(null).to.be.a('null');
         *     expect(undefined).to.be.an('undefined');
         *     expect(new Error).to.be.an('error');
         *     expect(new Promise).to.be.a('promise');
         *     expect(new Float32Array()).to.be.a('float32array');
         *     expect(Symbol()).to.be.a('symbol');
         *
         *     // es6 overrides
         *     expect({[Symbol.toStringTag]:()=>'foo'}).to.be.a('foo');
         *
         *     // language chain
         *     expect(foo).to.be.an.instanceof(Foo);
         *
         * @name a
         * @alias an
         * @param {String} type
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function an (type, msg) {
            if (msg) flag(this, 'message', msg);
            type = type.toLowerCase();
            var obj = flag(this, 'object')
                , article = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(type.charAt(0)) ? 'an ' : 'a ';

            this.assert(
                type === _.type(obj)
                , 'expected #{this} to be ' + article + type
                , 'expected #{this} not to be ' + article + type
            );
        }

        Assertion.addChainableMethod('an', an);
        Assertion.addChainableMethod('a', an);

        /**
         * ### .include(value)
         *
         * The `include` and `contain` assertions can be used as either property
         * based language chains or as methods to assert the inclusion of an object
         * in an array or a substring in a string. When used as language chains,
         * they toggle the `contains` flag for the `keys` assertion.
         *
         *     expect([1,2,3]).to.include(2);
         *     expect('foobar').to.contain('foo');
         *     expect({ foo: 'bar', hello: 'universe' }).to.include.keys('foo');
         *
         * @name include
         * @alias contain
         * @alias includes
         * @alias contains
         * @param {Object|String|Number} obj
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function includeChainingBehavior () {
            flag(this, 'contains', true);
        }

        function include (val, msg) {
            _.expectTypes(this, ['array', 'object', 'string']);

            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            var expected = false;

            if (_.type(obj) === 'array' && _.type(val) === 'object') {
                for (var i in obj) {
                    if (_.eql(obj[i], val)) {
                        expected = true;
                        break;
                    }
                }
            } else if (_.type(val) === 'object') {
                if (!flag(this, 'negate')) {
                    for (var k in val) new Assertion(obj).property(k, val[k]);
                    return;
                }
                var subset = {};
                for (var k in val) subset[k] = obj[k];
                expected = _.eql(subset, val);
            } else {
                expected = (obj != undefined) && ~obj.indexOf(val);
            }
            this.assert(
                expected
                , 'expected #{this} to include ' + _.inspect(val)
                , 'expected #{this} to not include ' + _.inspect(val));
        }

        Assertion.addChainableMethod('include', include, includeChainingBehavior);
        Assertion.addChainableMethod('contain', include, includeChainingBehavior);
        Assertion.addChainableMethod('contains', include, includeChainingBehavior);
        Assertion.addChainableMethod('includes', include, includeChainingBehavior);

        /**
         * ### .ok
         *
         * Asserts that the target is truthy.
         *
         *     expect('everything').to.be.ok;
         *     expect(1).to.be.ok;
         *     expect(false).to.not.be.ok;
         *     expect(undefined).to.not.be.ok;
         *     expect(null).to.not.be.ok;
         *
         * @name ok
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('ok', function () {
            this.assert(
                flag(this, 'object')
                , 'expected #{this} to be truthy'
                , 'expected #{this} to be falsy');
        });

        /**
         * ### .true
         *
         * Asserts that the target is `true`.
         *
         *     expect(true).to.be.true;
         *     expect(1).to.not.be.true;
         *
         * @name true
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('true', function () {
            this.assert(
                true === flag(this, 'object')
                , 'expected #{this} to be true'
                , 'expected #{this} to be false'
                , this.negate ? false : true
            );
        });

        /**
         * ### .false
         *
         * Asserts that the target is `false`.
         *
         *     expect(false).to.be.false;
         *     expect(0).to.not.be.false;
         *
         * @name false
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('false', function () {
            this.assert(
                false === flag(this, 'object')
                , 'expected #{this} to be false'
                , 'expected #{this} to be true'
                , this.negate ? true : false
            );
        });

        /**
         * ### .null
         *
         * Asserts that the target is `null`.
         *
         *     expect(null).to.be.null;
         *     expect(undefined).to.not.be.null;
         *
         * @name null
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('null', function () {
            this.assert(
                null === flag(this, 'object')
                , 'expected #{this} to be null'
                , 'expected #{this} not to be null'
            );
        });

        /**
         * ### .undefined
         *
         * Asserts that the target is `undefined`.
         *
         *     expect(undefined).to.be.undefined;
         *     expect(null).to.not.be.undefined;
         *
         * @name undefined
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('undefined', function () {
            this.assert(
                undefined === flag(this, 'object')
                , 'expected #{this} to be undefined'
                , 'expected #{this} not to be undefined'
            );
        });

        /**
         * ### .NaN
         * Asserts that the target is `NaN`.
         *
         *     expect('foo').to.be.NaN;
         *     expect(4).not.to.be.NaN;
         *
         * @name NaN
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('NaN', function () {
            this.assert(
                isNaN(flag(this, 'object'))
                , 'expected #{this} to be NaN'
                , 'expected #{this} not to be NaN'
            );
        });

        /**
         * ### .exist
         *
         * Asserts that the target is neither `null` nor `undefined`.
         *
         *     var foo = 'hi'
         *       , bar = null
         *       , baz;
         *
         *     expect(foo).to.exist;
         *     expect(bar).to.not.exist;
         *     expect(baz).to.not.exist;
         *
         * @name exist
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('exist', function () {
            this.assert(
                null != flag(this, 'object')
                , 'expected #{this} to exist'
                , 'expected #{this} to not exist'
            );
        });


        /**
         * ### .empty
         *
         * Asserts that the target's length is `0`. For arrays and strings, it checks
         * the `length` property. For objects, it gets the count of
         * enumerable keys.
         *
         *     expect([]).to.be.empty;
         *     expect('').to.be.empty;
         *     expect({}).to.be.empty;
         *
         * @name empty
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('empty', function () {
            var obj = flag(this, 'object')
                , expected = obj;

            if (Array.isArray(obj) || 'string' === typeof object) {
                expected = obj.length;
            } else if (typeof obj === 'object') {
                expected = Object.keys(obj).length;
            }

            this.assert(
                !expected
                , 'expected #{this} to be empty'
                , 'expected #{this} not to be empty'
            );
        });

        /**
         * ### .arguments
         *
         * Asserts that the target is an arguments object.
         *
         *     function test () {
   *       expect(arguments).to.be.arguments;
   *     }
         *
         * @name arguments
         * @alias Arguments
         * @namespace BDD
         * @api public
         */

        function checkArguments () {
            var obj = flag(this, 'object')
                , type = Object.prototype.toString.call(obj);
            this.assert(
                '[object Arguments]' === type
                , 'expected #{this} to be arguments but got ' + type
                , 'expected #{this} to not be arguments'
            );
        }

        Assertion.addProperty('arguments', checkArguments);
        Assertion.addProperty('Arguments', checkArguments);

        /**
         * ### .equal(value)
         *
         * Asserts that the target is strictly equal (`===`) to `value`.
         * Alternately, if the `deep` flag is set, asserts that
         * the target is deeply equal to `value`.
         *
         *     expect('hello').to.equal('hello');
         *     expect(42).to.equal(42);
         *     expect(1).to.not.equal(true);
         *     expect({ foo: 'bar' }).to.not.equal({ foo: 'bar' });
         *     expect({ foo: 'bar' }).to.deep.equal({ foo: 'bar' });
         *
         * @name equal
         * @alias equals
         * @alias eq
         * @alias deep.equal
         * @param {Mixed} value
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertEqual (val, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            if (flag(this, 'deep')) {
                return this.eql(val);
            } else {
                this.assert(
                    val === obj
                    , 'expected #{this} to equal #{exp}'
                    , 'expected #{this} to not equal #{exp}'
                    , val
                    , this._obj
                    , true
                );
            }
        }

        Assertion.addMethod('equal', assertEqual);
        Assertion.addMethod('equals', assertEqual);
        Assertion.addMethod('eq', assertEqual);

        /**
         * ### .eql(value)
         *
         * Asserts that the target is deeply equal to `value`.
         *
         *     expect({ foo: 'bar' }).to.eql({ foo: 'bar' });
         *     expect([ 1, 2, 3 ]).to.eql([ 1, 2, 3 ]);
         *
         * @name eql
         * @alias eqls
         * @param {Mixed} value
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertEql(obj, msg) {
            if (msg) flag(this, 'message', msg);
            this.assert(
                _.eql(obj, flag(this, 'object'))
                , 'expected #{this} to deeply equal #{exp}'
                , 'expected #{this} to not deeply equal #{exp}'
                , obj
                , this._obj
                , true
            );
        }

        Assertion.addMethod('eql', assertEql);
        Assertion.addMethod('eqls', assertEql);

        /**
         * ### .above(value)
         *
         * Asserts that the target is greater than `value`.
         *
         *     expect(10).to.be.above(5);
         *
         * Can also be used in conjunction with `length` to
         * assert a minimum length. The benefit being a
         * more informative error message than if the length
         * was supplied directly.
         *
         *     expect('foo').to.have.length.above(2);
         *     expect([ 1, 2, 3 ]).to.have.length.above(2);
         *
         * @name above
         * @alias gt
         * @alias greaterThan
         * @param {Number} value
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertAbove (n, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            if (flag(this, 'doLength')) {
                new Assertion(obj, msg).to.have.property('length');
                var len = obj.length;
                this.assert(
                    len > n
                    , 'expected #{this} to have a length above #{exp} but got #{act}'
                    , 'expected #{this} to not have a length above #{exp}'
                    , n
                    , len
                );
            } else {
                this.assert(
                    obj > n
                    , 'expected #{this} to be above ' + n
                    , 'expected #{this} to be at most ' + n
                );
            }
        }

        Assertion.addMethod('above', assertAbove);
        Assertion.addMethod('gt', assertAbove);
        Assertion.addMethod('greaterThan', assertAbove);

        /**
         * ### .least(value)
         *
         * Asserts that the target is greater than or equal to `value`.
         *
         *     expect(10).to.be.at.least(10);
         *
         * Can also be used in conjunction with `length` to
         * assert a minimum length. The benefit being a
         * more informative error message than if the length
         * was supplied directly.
         *
         *     expect('foo').to.have.length.of.at.least(2);
         *     expect([ 1, 2, 3 ]).to.have.length.of.at.least(3);
         *
         * @name least
         * @alias gte
         * @param {Number} value
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertLeast (n, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            if (flag(this, 'doLength')) {
                new Assertion(obj, msg).to.have.property('length');
                var len = obj.length;
                this.assert(
                    len >= n
                    , 'expected #{this} to have a length at least #{exp} but got #{act}'
                    , 'expected #{this} to have a length below #{exp}'
                    , n
                    , len
                );
            } else {
                this.assert(
                    obj >= n
                    , 'expected #{this} to be at least ' + n
                    , 'expected #{this} to be below ' + n
                );
            }
        }

        Assertion.addMethod('least', assertLeast);
        Assertion.addMethod('gte', assertLeast);

        /**
         * ### .below(value)
         *
         * Asserts that the target is less than `value`.
         *
         *     expect(5).to.be.below(10);
         *
         * Can also be used in conjunction with `length` to
         * assert a maximum length. The benefit being a
         * more informative error message than if the length
         * was supplied directly.
         *
         *     expect('foo').to.have.length.below(4);
         *     expect([ 1, 2, 3 ]).to.have.length.below(4);
         *
         * @name below
         * @alias lt
         * @alias lessThan
         * @param {Number} value
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertBelow (n, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            if (flag(this, 'doLength')) {
                new Assertion(obj, msg).to.have.property('length');
                var len = obj.length;
                this.assert(
                    len < n
                    , 'expected #{this} to have a length below #{exp} but got #{act}'
                    , 'expected #{this} to not have a length below #{exp}'
                    , n
                    , len
                );
            } else {
                this.assert(
                    obj < n
                    , 'expected #{this} to be below ' + n
                    , 'expected #{this} to be at least ' + n
                );
            }
        }

        Assertion.addMethod('below', assertBelow);
        Assertion.addMethod('lt', assertBelow);
        Assertion.addMethod('lessThan', assertBelow);

        /**
         * ### .most(value)
         *
         * Asserts that the target is less than or equal to `value`.
         *
         *     expect(5).to.be.at.most(5);
         *
         * Can also be used in conjunction with `length` to
         * assert a maximum length. The benefit being a
         * more informative error message than if the length
         * was supplied directly.
         *
         *     expect('foo').to.have.length.of.at.most(4);
         *     expect([ 1, 2, 3 ]).to.have.length.of.at.most(3);
         *
         * @name most
         * @alias lte
         * @param {Number} value
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertMost (n, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            if (flag(this, 'doLength')) {
                new Assertion(obj, msg).to.have.property('length');
                var len = obj.length;
                this.assert(
                    len <= n
                    , 'expected #{this} to have a length at most #{exp} but got #{act}'
                    , 'expected #{this} to have a length above #{exp}'
                    , n
                    , len
                );
            } else {
                this.assert(
                    obj <= n
                    , 'expected #{this} to be at most ' + n
                    , 'expected #{this} to be above ' + n
                );
            }
        }

        Assertion.addMethod('most', assertMost);
        Assertion.addMethod('lte', assertMost);

        /**
         * ### .within(start, finish)
         *
         * Asserts that the target is within a range.
         *
         *     expect(7).to.be.within(5,10);
         *
         * Can also be used in conjunction with `length` to
         * assert a length range. The benefit being a
         * more informative error message than if the length
         * was supplied directly.
         *
         *     expect('foo').to.have.length.within(2,4);
         *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
         *
         * @name within
         * @param {Number} start lowerbound inclusive
         * @param {Number} finish upperbound inclusive
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        Assertion.addMethod('within', function (start, finish, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object')
                , range = start + '..' + finish;
            if (flag(this, 'doLength')) {
                new Assertion(obj, msg).to.have.property('length');
                var len = obj.length;
                this.assert(
                    len >= start && len <= finish
                    , 'expected #{this} to have a length within ' + range
                    , 'expected #{this} to not have a length within ' + range
                );
            } else {
                this.assert(
                    obj >= start && obj <= finish
                    , 'expected #{this} to be within ' + range
                    , 'expected #{this} to not be within ' + range
                );
            }
        });

        /**
         * ### .instanceof(constructor)
         *
         * Asserts that the target is an instance of `constructor`.
         *
         *     var Tea = function (name) { this.name = name; }
         *       , Chai = new Tea('chai');
         *
         *     expect(Chai).to.be.an.instanceof(Tea);
         *     expect([ 1, 2, 3 ]).to.be.instanceof(Array);
         *
         * @name instanceof
         * @param {Constructor} constructor
         * @param {String} message _optional_
         * @alias instanceOf
         * @namespace BDD
         * @api public
         */

        function assertInstanceOf (constructor, msg) {
            if (msg) flag(this, 'message', msg);
            var name = _.getName(constructor);
            this.assert(
                flag(this, 'object') instanceof constructor
                , 'expected #{this} to be an instance of ' + name
                , 'expected #{this} to not be an instance of ' + name
            );
        };

        Assertion.addMethod('instanceof', assertInstanceOf);
        Assertion.addMethod('instanceOf', assertInstanceOf);

        /**
         * ### .property(name, [value])
         *
         * Asserts that the target has a property `name`, optionally asserting that
         * the value of that property is strictly equal to  `value`.
         * If the `deep` flag is set, you can use dot- and bracket-notation for deep
         * references into objects and arrays.
         *
         *     // simple referencing
         *     var obj = { foo: 'bar' };
         *     expect(obj).to.have.property('foo');
         *     expect(obj).to.have.property('foo', 'bar');
         *
         *     // deep referencing
         *     var deepObj = {
   *         green: { tea: 'matcha' }
   *       , teas: [ 'chai', 'matcha', { tea: 'konacha' } ]
   *     };
         *
         *     expect(deepObj).to.have.deep.property('green.tea', 'matcha');
         *     expect(deepObj).to.have.deep.property('teas[1]', 'matcha');
         *     expect(deepObj).to.have.deep.property('teas[2].tea', 'konacha');
         *
         * You can also use an array as the starting point of a `deep.property`
         * assertion, or traverse nested arrays.
         *
         *     var arr = [
         *         [ 'chai', 'matcha', 'konacha' ]
         *       , [ { tea: 'chai' }
         *         , { tea: 'matcha' }
         *         , { tea: 'konacha' } ]
         *     ];
         *
         *     expect(arr).to.have.deep.property('[0][1]', 'matcha');
         *     expect(arr).to.have.deep.property('[1][2].tea', 'konacha');
         *
         * Furthermore, `property` changes the subject of the assertion
         * to be the value of that property from the original object. This
         * permits for further chainable assertions on that property.
         *
         *     expect(obj).to.have.property('foo')
         *       .that.is.a('string');
         *     expect(deepObj).to.have.property('green')
         *       .that.is.an('object')
         *       .that.deep.equals({ tea: 'matcha' });
         *     expect(deepObj).to.have.property('teas')
         *       .that.is.an('array')
         *       .with.deep.property('[2]')
         *         .that.deep.equals({ tea: 'konacha' });
         *
         * Note that dots and bracket in `name` must be backslash-escaped when
         * the `deep` flag is set, while they must NOT be escaped when the `deep`
         * flag is not set.
         *
         *     // simple referencing
         *     var css = { '.link[target]': 42 };
         *     expect(css).to.have.property('.link[target]', 42);
         *
         *     // deep referencing
         *     var deepCss = { '.link': { '[target]': 42 }};
         *     expect(deepCss).to.have.deep.property('\\.link.\\[target\\]', 42);
         *
         * @name property
         * @alias deep.property
         * @param {String} name
         * @param {Mixed} value (optional)
         * @param {String} message _optional_
         * @returns value of property for chaining
         * @namespace BDD
         * @api public
         */

        Assertion.addMethod('property', function (name, val, msg) {
            if (msg) flag(this, 'message', msg);

            var isDeep = !!flag(this, 'deep')
                , descriptor = isDeep ? 'deep property ' : 'property '
                , negate = flag(this, 'negate')
                , obj = flag(this, 'object')
                , pathInfo = isDeep ? _.getPathInfo(name, obj) : null
                , hasProperty = isDeep
                ? pathInfo.exists
                : _.hasProperty(name, obj)
                , value = isDeep
                ? pathInfo.value
                : obj[name];

            if (negate && arguments.length > 1) {
                if (undefined === value) {
                    msg = (msg != null) ? msg + ': ' : '';
                    throw new Error(msg + _.inspect(obj) + ' has no ' + descriptor + _.inspect(name));
                }
            } else {
                this.assert(
                    hasProperty
                    , 'expected #{this} to have a ' + descriptor + _.inspect(name)
                    , 'expected #{this} to not have ' + descriptor + _.inspect(name));
            }

            if (arguments.length > 1) {
                this.assert(
                    val === value
                    , 'expected #{this} to have a ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'
                    , 'expected #{this} to not have a ' + descriptor + _.inspect(name) + ' of #{act}'
                    , val
                    , value
                );
            }

            flag(this, 'object', value);
        });


        /**
         * ### .ownProperty(name)
         *
         * Asserts that the target has an own property `name`.
         *
         *     expect('test').to.have.ownProperty('length');
         *
         * @name ownProperty
         * @alias haveOwnProperty
         * @param {String} name
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertOwnProperty (name, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            this.assert(
                obj.hasOwnProperty(name)
                , 'expected #{this} to have own property ' + _.inspect(name)
                , 'expected #{this} to not have own property ' + _.inspect(name)
            );
        }

        Assertion.addMethod('ownProperty', assertOwnProperty);
        Assertion.addMethod('haveOwnProperty', assertOwnProperty);

        /**
         * ### .ownPropertyDescriptor(name[, descriptor[, message]])
         *
         * Asserts that the target has an own property descriptor `name`, that optionally matches `descriptor`.
         *
         *     expect('test').to.have.ownPropertyDescriptor('length');
         *     expect('test').to.have.ownPropertyDescriptor('length', { enumerable: false, configurable: false, writable: false, value: 4 });
         *     expect('test').not.to.have.ownPropertyDescriptor('length', { enumerable: false, configurable: false, writable: false, value: 3 });
         *     expect('test').ownPropertyDescriptor('length').to.have.property('enumerable', false);
         *     expect('test').ownPropertyDescriptor('length').to.have.keys('value');
         *
         * @name ownPropertyDescriptor
         * @alias haveOwnPropertyDescriptor
         * @param {String} name
         * @param {Object} descriptor _optional_
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertOwnPropertyDescriptor (name, descriptor, msg) {
            if (typeof descriptor === 'string') {
                msg = descriptor;
                descriptor = null;
            }
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            var actualDescriptor = Object.getOwnPropertyDescriptor(Object(obj), name);
            if (actualDescriptor && descriptor) {
                this.assert(
                    _.eql(descriptor, actualDescriptor)
                    , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to match ' + _.inspect(descriptor) + ', got ' + _.inspect(actualDescriptor)
                    , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to not match ' + _.inspect(descriptor)
                    , descriptor
                    , actualDescriptor
                    , true
                );
            } else {
                this.assert(
                    actualDescriptor
                    , 'expected #{this} to have an own property descriptor for ' + _.inspect(name)
                    , 'expected #{this} to not have an own property descriptor for ' + _.inspect(name)
                );
            }
            flag(this, 'object', actualDescriptor);
        }

        Assertion.addMethod('ownPropertyDescriptor', assertOwnPropertyDescriptor);
        Assertion.addMethod('haveOwnPropertyDescriptor', assertOwnPropertyDescriptor);

        /**
         * ### .length
         *
         * Sets the `doLength` flag later used as a chain precursor to a value
         * comparison for the `length` property.
         *
         *     expect('foo').to.have.length.above(2);
         *     expect([ 1, 2, 3 ]).to.have.length.above(2);
         *     expect('foo').to.have.length.below(4);
         *     expect([ 1, 2, 3 ]).to.have.length.below(4);
         *     expect('foo').to.have.length.within(2,4);
         *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
         *
         * *Deprecation notice:* Using `length` as an assertion will be deprecated
         * in version 2.4.0 and removed in 3.0.0. Code using the old style of
         * asserting for `length` property value using `length(value)` should be
         * switched to use `lengthOf(value)` instead.
         *
         * @name length
         * @namespace BDD
         * @api public
         */

        /**
         * ### .lengthOf(value[, message])
         *
         * Asserts that the target's `length` property has
         * the expected value.
         *
         *     expect([ 1, 2, 3]).to.have.lengthOf(3);
         *     expect('foobar').to.have.lengthOf(6);
         *
         * @name lengthOf
         * @param {Number} length
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertLengthChain () {
            flag(this, 'doLength', true);
        }

        function assertLength (n, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            new Assertion(obj, msg).to.have.property('length');
            var len = obj.length;

            this.assert(
                len == n
                , 'expected #{this} to have a length of #{exp} but got #{act}'
                , 'expected #{this} to not have a length of #{act}'
                , n
                , len
            );
        }

        Assertion.addChainableMethod('length', assertLength, assertLengthChain);
        Assertion.addMethod('lengthOf', assertLength);

        /**
         * ### .match(regexp)
         *
         * Asserts that the target matches a regular expression.
         *
         *     expect('foobar').to.match(/^foo/);
         *
         * @name match
         * @alias matches
         * @param {RegExp} RegularExpression
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */
        function assertMatch(re, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            this.assert(
                re.exec(obj)
                , 'expected #{this} to match ' + re
                , 'expected #{this} not to match ' + re
            );
        }

        Assertion.addMethod('match', assertMatch);
        Assertion.addMethod('matches', assertMatch);

        /**
         * ### .string(string)
         *
         * Asserts that the string target contains another string.
         *
         *     expect('foobar').to.have.string('bar');
         *
         * @name string
         * @param {String} string
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        Assertion.addMethod('string', function (str, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            new Assertion(obj, msg).is.a('string');

            this.assert(
                ~obj.indexOf(str)
                , 'expected #{this} to contain ' + _.inspect(str)
                , 'expected #{this} to not contain ' + _.inspect(str)
            );
        });


        /**
         * ### .keys(key1, [key2], [...])
         *
         * Asserts that the target contains any or all of the passed-in keys.
         * Use in combination with `any`, `all`, `contains`, or `have` will affect
         * what will pass.
         *
         * When used in conjunction with `any`, at least one key that is passed
         * in must exist in the target object. This is regardless whether or not
         * the `have` or `contain` qualifiers are used. Note, either `any` or `all`
         * should be used in the assertion. If neither are used, the assertion is
         * defaulted to `all`.
         *
         * When both `all` and `contain` are used, the target object must have at
         * least all of the passed-in keys but may have more keys not listed.
         *
         * When both `all` and `have` are used, the target object must both contain
         * all of the passed-in keys AND the number of keys in the target object must
         * match the number of keys passed in (in other words, a target object must
         * have all and only all of the passed-in keys).
         *
         *     expect({ foo: 1, bar: 2 }).to.have.any.keys('foo', 'baz');
         *     expect({ foo: 1, bar: 2 }).to.have.any.keys('foo');
         *     expect({ foo: 1, bar: 2 }).to.contain.any.keys('bar', 'baz');
         *     expect({ foo: 1, bar: 2 }).to.contain.any.keys(['foo']);
         *     expect({ foo: 1, bar: 2 }).to.contain.any.keys({'foo': 6});
         *     expect({ foo: 1, bar: 2 }).to.have.all.keys(['bar', 'foo']);
         *     expect({ foo: 1, bar: 2 }).to.have.all.keys({'bar': 6, 'foo': 7});
         *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys(['bar', 'foo']);
         *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.all.keys({'bar': 6});
         *
         *
         * @name keys
         * @alias key
         * @param {...String|Array|Object} keys
         * @namespace BDD
         * @api public
         */

        function assertKeys (keys) {
            var obj = flag(this, 'object')
                , str
                , ok = true
                , mixedArgsMsg = 'keys must be given single argument of Array|Object|String, or multiple String arguments';

            switch (_.type(keys)) {
                case "array":
                    if (arguments.length > 1) throw (new Error(mixedArgsMsg));
                    break;
                case "object":
                    if (arguments.length > 1) throw (new Error(mixedArgsMsg));
                    keys = Object.keys(keys);
                    break;
                default:
                    keys = Array.prototype.slice.call(arguments);
            }

            if (!keys.length) throw new Error('keys required');

            var actual = Object.keys(obj)
                , expected = keys
                , len = keys.length
                , any = flag(this, 'any')
                , all = flag(this, 'all');

            if (!any && !all) {
                all = true;
            }

            // Has any
            if (any) {
                var intersection = expected.filter(function(key) {
                    return ~actual.indexOf(key);
                });
                ok = intersection.length > 0;
            }

            // Has all
            if (all) {
                ok = keys.every(function(key){
                    return ~actual.indexOf(key);
                });
                if (!flag(this, 'negate') && !flag(this, 'contains')) {
                    ok = ok && keys.length == actual.length;
                }
            }

            // Key string
            if (len > 1) {
                keys = keys.map(function(key){
                    return _.inspect(key);
                });
                var last = keys.pop();
                if (all) {
                    str = keys.join(', ') + ', and ' + last;
                }
                if (any) {
                    str = keys.join(', ') + ', or ' + last;
                }
            } else {
                str = _.inspect(keys[0]);
            }

            // Form
            str = (len > 1 ? 'keys ' : 'key ') + str;

            // Have / include
            str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;

            // Assertion
            this.assert(
                ok
                , 'expected #{this} to ' + str
                , 'expected #{this} to not ' + str
                , expected.slice(0).sort()
                , actual.sort()
                , true
            );
        }

        Assertion.addMethod('keys', assertKeys);
        Assertion.addMethod('key', assertKeys);

        /**
         * ### .throw(constructor)
         *
         * Asserts that the function target will throw a specific error, or specific type of error
         * (as determined using `instanceof`), optionally with a RegExp or string inclusion test
         * for the error's message.
         *
         *     var err = new ReferenceError('This is a bad function.');
         *     var fn = function () { throw err; }
         *     expect(fn).to.throw(ReferenceError);
         *     expect(fn).to.throw(Error);
         *     expect(fn).to.throw(/bad function/);
         *     expect(fn).to.not.throw('good function');
         *     expect(fn).to.throw(ReferenceError, /bad function/);
         *     expect(fn).to.throw(err);
         *
         * Please note that when a throw expectation is negated, it will check each
         * parameter independently, starting with error constructor type. The appropriate way
         * to check for the existence of a type of error but for a message that does not match
         * is to use `and`.
         *
         *     expect(fn).to.throw(ReferenceError)
         *        .and.not.throw(/good function/);
         *
         * @name throw
         * @alias throws
         * @alias Throw
         * @param {ErrorConstructor} constructor
         * @param {String|RegExp} expected error message
         * @param {String} message _optional_
         * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
         * @returns error for chaining (null if no error)
         * @namespace BDD
         * @api public
         */

        function assertThrows (constructor, errMsg, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            new Assertion(obj, msg).is.a('function');

            var thrown = false
                , desiredError = null
                , name = null
                , thrownError = null;

            if (arguments.length === 0) {
                errMsg = null;
                constructor = null;
            } else if (constructor && (constructor instanceof RegExp || 'string' === typeof constructor)) {
                errMsg = constructor;
                constructor = null;
            } else if (constructor && constructor instanceof Error) {
                desiredError = constructor;
                constructor = null;
                errMsg = null;
            } else if (typeof constructor === 'function') {
                name = constructor.prototype.name;
                if (!name || (name === 'Error' && constructor !== Error)) {
                    name = constructor.name || (new constructor()).name;
                }
            } else {
                constructor = null;
            }

            try {
                obj();
            } catch (err) {
                // first, check desired error
                if (desiredError) {
                    this.assert(
                        err === desiredError
                        , 'expected #{this} to throw #{exp} but #{act} was thrown'
                        , 'expected #{this} to not throw #{exp}'
                        , (desiredError instanceof Error ? desiredError.toString() : desiredError)
                        , (err instanceof Error ? err.toString() : err)
                    );

                    flag(this, 'object', err);
                    return this;
                }

                // next, check constructor
                if (constructor) {
                    this.assert(
                        err instanceof constructor
                        , 'expected #{this} to throw #{exp} but #{act} was thrown'
                        , 'expected #{this} to not throw #{exp} but #{act} was thrown'
                        , name
                        , (err instanceof Error ? err.toString() : err)
                    );

                    if (!errMsg) {
                        flag(this, 'object', err);
                        return this;
                    }
                }

                // next, check message
                var message = 'error' === _.type(err) && "message" in err
                    ? err.message
                    : '' + err;

                if ((message != null) && errMsg && errMsg instanceof RegExp) {
                    this.assert(
                        errMsg.exec(message)
                        , 'expected #{this} to throw error matching #{exp} but got #{act}'
                        , 'expected #{this} to throw error not matching #{exp}'
                        , errMsg
                        , message
                    );

                    flag(this, 'object', err);
                    return this;
                } else if ((message != null) && errMsg && 'string' === typeof errMsg) {
                    this.assert(
                        ~message.indexOf(errMsg)
                        , 'expected #{this} to throw error including #{exp} but got #{act}'
                        , 'expected #{this} to throw error not including #{act}'
                        , errMsg
                        , message
                    );

                    flag(this, 'object', err);
                    return this;
                } else {
                    thrown = true;
                    thrownError = err;
                }
            }

            var actuallyGot = ''
                , expectedThrown = name !== null
                ? name
                : desiredError
                ? '#{exp}' //_.inspect(desiredError)
                : 'an error';

            if (thrown) {
                actuallyGot = ' but #{act} was thrown'
            }

            this.assert(
                thrown === true
                , 'expected #{this} to throw ' + expectedThrown + actuallyGot
                , 'expected #{this} to not throw ' + expectedThrown + actuallyGot
                , (desiredError instanceof Error ? desiredError.toString() : desiredError)
                , (thrownError instanceof Error ? thrownError.toString() : thrownError)
            );

            flag(this, 'object', thrownError);
        };

        Assertion.addMethod('throw', assertThrows);
        Assertion.addMethod('throws', assertThrows);
        Assertion.addMethod('Throw', assertThrows);

        /**
         * ### .respondTo(method)
         *
         * Asserts that the object or class target will respond to a method.
         *
         *     Klass.prototype.bar = function(){};
         *     expect(Klass).to.respondTo('bar');
         *     expect(obj).to.respondTo('bar');
         *
         * To check if a constructor will respond to a static function,
         * set the `itself` flag.
         *
         *     Klass.baz = function(){};
         *     expect(Klass).itself.to.respondTo('baz');
         *
         * @name respondTo
         * @alias respondsTo
         * @param {String} method
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function respondTo (method, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object')
                , itself = flag(this, 'itself')
                , context = ('function' === _.type(obj) && !itself)
                ? obj.prototype[method]
                : obj[method];

            this.assert(
                'function' === typeof context
                , 'expected #{this} to respond to ' + _.inspect(method)
                , 'expected #{this} to not respond to ' + _.inspect(method)
            );
        }

        Assertion.addMethod('respondTo', respondTo);
        Assertion.addMethod('respondsTo', respondTo);

        /**
         * ### .itself
         *
         * Sets the `itself` flag, later used by the `respondTo` assertion.
         *
         *     function Foo() {}
         *     Foo.bar = function() {}
         *     Foo.prototype.baz = function() {}
         *
         *     expect(Foo).itself.to.respondTo('bar');
         *     expect(Foo).itself.not.to.respondTo('baz');
         *
         * @name itself
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('itself', function () {
            flag(this, 'itself', true);
        });

        /**
         * ### .satisfy(method)
         *
         * Asserts that the target passes a given truth test.
         *
         *     expect(1).to.satisfy(function(num) { return num > 0; });
         *
         * @name satisfy
         * @alias satisfies
         * @param {Function} matcher
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function satisfy (matcher, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');
            var result = matcher(obj);
            this.assert(
                result
                , 'expected #{this} to satisfy ' + _.objDisplay(matcher)
                , 'expected #{this} to not satisfy' + _.objDisplay(matcher)
                , this.negate ? false : true
                , result
            );
        }

        Assertion.addMethod('satisfy', satisfy);
        Assertion.addMethod('satisfies', satisfy);

        /**
         * ### .closeTo(expected, delta)
         *
         * Asserts that the target is equal `expected`, to within a +/- `delta` range.
         *
         *     expect(1.5).to.be.closeTo(1, 0.5);
         *
         * @name closeTo
         * @alias approximately
         * @param {Number} expected
         * @param {Number} delta
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function closeTo(expected, delta, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');

            new Assertion(obj, msg).is.a('number');
            if (_.type(expected) !== 'number' || _.type(delta) !== 'number') {
                throw new Error('the arguments to closeTo or approximately must be numbers');
            }

            this.assert(
                Math.abs(obj - expected) <= delta
                , 'expected #{this} to be close to ' + expected + ' +/- ' + delta
                , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta
            );
        }

        Assertion.addMethod('closeTo', closeTo);
        Assertion.addMethod('approximately', closeTo);

        function isSubsetOf(subset, superset, cmp) {
            return subset.every(function(elem) {
                if (!cmp) return superset.indexOf(elem) !== -1;

                return superset.some(function(elem2) {
                    return cmp(elem, elem2);
                });
            })
        }

        /**
         * ### .members(set)
         *
         * Asserts that the target is a superset of `set`,
         * or that the target and `set` have the same strictly-equal (===) members.
         * Alternately, if the `deep` flag is set, set members are compared for deep
         * equality.
         *
         *     expect([1, 2, 3]).to.include.members([3, 2]);
         *     expect([1, 2, 3]).to.not.include.members([3, 2, 8]);
         *
         *     expect([4, 2]).to.have.members([2, 4]);
         *     expect([5, 2]).to.not.have.members([5, 2, 1]);
         *
         *     expect([{ id: 1 }]).to.deep.include.members([{ id: 1 }]);
         *
         * @name members
         * @param {Array} set
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        Assertion.addMethod('members', function (subset, msg) {
            if (msg) flag(this, 'message', msg);
            var obj = flag(this, 'object');

            new Assertion(obj).to.be.an('array');
            new Assertion(subset).to.be.an('array');

            var cmp = flag(this, 'deep') ? _.eql : undefined;

            if (flag(this, 'contains')) {
                return this.assert(
                    isSubsetOf(subset, obj, cmp)
                    , 'expected #{this} to be a superset of #{act}'
                    , 'expected #{this} to not be a superset of #{act}'
                    , obj
                    , subset
                );
            }

            this.assert(
                isSubsetOf(obj, subset, cmp) && isSubsetOf(subset, obj, cmp)
                , 'expected #{this} to have the same members as #{act}'
                , 'expected #{this} to not have the same members as #{act}'
                , obj
                , subset
            );
        });

        /**
         * ### .oneOf(list)
         *
         * Assert that a value appears somewhere in the top level of array `list`.
         *
         *     expect('a').to.be.oneOf(['a', 'b', 'c']);
         *     expect(9).to.not.be.oneOf(['z']);
         *     expect([3]).to.not.be.oneOf([1, 2, [3]]);
         *
         *     var three = [3];
         *     // for object-types, contents are not compared
         *     expect(three).to.not.be.oneOf([1, 2, [3]]);
         *     // comparing references works
         *     expect(three).to.be.oneOf([1, 2, three]);
         *
         * @name oneOf
         * @param {Array<*>} list
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function oneOf (list, msg) {
            if (msg) flag(this, 'message', msg);
            var expected = flag(this, 'object');
            new Assertion(list).to.be.an('array');

            this.assert(
                list.indexOf(expected) > -1
                , 'expected #{this} to be one of #{exp}'
                , 'expected #{this} to not be one of #{exp}'
                , list
                , expected
            );
        }

        Assertion.addMethod('oneOf', oneOf);


        /**
         * ### .change(function)
         *
         * Asserts that a function changes an object property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val += 3 };
         *     var noChangeFn = function() { return 'foo' + 'bar'; }
         *     expect(fn).to.change(obj, 'val');
         *     expect(noChangeFn).to.not.change(obj, 'val')
         *
         * @name change
         * @alias changes
         * @alias Change
         * @param {String} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertChanges (object, prop, msg) {
            if (msg) flag(this, 'message', msg);
            var fn = flag(this, 'object');
            new Assertion(object, msg).to.have.property(prop);
            new Assertion(fn).is.a('function');

            var initial = object[prop];
            fn();

            this.assert(
                initial !== object[prop]
                , 'expected .' + prop + ' to change'
                , 'expected .' + prop + ' to not change'
            );
        }

        Assertion.addChainableMethod('change', assertChanges);
        Assertion.addChainableMethod('changes', assertChanges);

        /**
         * ### .increase(function)
         *
         * Asserts that a function increases an object property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val = 15 };
         *     expect(fn).to.increase(obj, 'val');
         *
         * @name increase
         * @alias increases
         * @alias Increase
         * @param {String} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertIncreases (object, prop, msg) {
            if (msg) flag(this, 'message', msg);
            var fn = flag(this, 'object');
            new Assertion(object, msg).to.have.property(prop);
            new Assertion(fn).is.a('function');

            var initial = object[prop];
            fn();

            this.assert(
                object[prop] - initial > 0
                , 'expected .' + prop + ' to increase'
                , 'expected .' + prop + ' to not increase'
            );
        }

        Assertion.addChainableMethod('increase', assertIncreases);
        Assertion.addChainableMethod('increases', assertIncreases);

        /**
         * ### .decrease(function)
         *
         * Asserts that a function decreases an object property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val = 5 };
         *     expect(fn).to.decrease(obj, 'val');
         *
         * @name decrease
         * @alias decreases
         * @alias Decrease
         * @param {String} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace BDD
         * @api public
         */

        function assertDecreases (object, prop, msg) {
            if (msg) flag(this, 'message', msg);
            var fn = flag(this, 'object');
            new Assertion(object, msg).to.have.property(prop);
            new Assertion(fn).is.a('function');

            var initial = object[prop];
            fn();

            this.assert(
                object[prop] - initial < 0
                , 'expected .' + prop + ' to decrease'
                , 'expected .' + prop + ' to not decrease'
            );
        }

        Assertion.addChainableMethod('decrease', assertDecreases);
        Assertion.addChainableMethod('decreases', assertDecreases);

        /**
         * ### .extensible
         *
         * Asserts that the target is extensible (can have new properties added to
         * it).
         *
         *     var nonExtensibleObject = Object.preventExtensions({});
         *     var sealedObject = Object.seal({});
         *     var frozenObject = Object.freeze({});
         *
         *     expect({}).to.be.extensible;
         *     expect(nonExtensibleObject).to.not.be.extensible;
         *     expect(sealedObject).to.not.be.extensible;
         *     expect(frozenObject).to.not.be.extensible;
         *
         * @name extensible
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('extensible', function() {
            var obj = flag(this, 'object');

            // In ES5, if the argument to this method is not an object (a primitive), then it will cause a TypeError.
            // In ES6, a non-object argument will be treated as if it was a non-extensible ordinary object, simply return false.
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible
            // The following provides ES6 behavior when a TypeError is thrown under ES5.

            var isExtensible;

            try {
                isExtensible = Object.isExtensible(obj);
            } catch (err) {
                if (err instanceof TypeError) isExtensible = false;
                else throw err;
            }

            this.assert(
                isExtensible
                , 'expected #{this} to be extensible'
                , 'expected #{this} to not be extensible'
            );
        });

        /**
         * ### .sealed
         *
         * Asserts that the target is sealed (cannot have new properties added to it
         * and its existing properties cannot be removed).
         *
         *     var sealedObject = Object.seal({});
         *     var frozenObject = Object.freeze({});
         *
         *     expect(sealedObject).to.be.sealed;
         *     expect(frozenObject).to.be.sealed;
         *     expect({}).to.not.be.sealed;
         *
         * @name sealed
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('sealed', function() {
            var obj = flag(this, 'object');

            // In ES5, if the argument to this method is not an object (a primitive), then it will cause a TypeError.
            // In ES6, a non-object argument will be treated as if it was a sealed ordinary object, simply return true.
            // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed
            // The following provides ES6 behavior when a TypeError is thrown under ES5.

            var isSealed;

            try {
                isSealed = Object.isSealed(obj);
            } catch (err) {
                if (err instanceof TypeError) isSealed = true;
                else throw err;
            }

            this.assert(
                isSealed
                , 'expected #{this} to be sealed'
                , 'expected #{this} to not be sealed'
            );
        });

        /**
         * ### .frozen
         *
         * Asserts that the target is frozen (cannot have new properties added to it
         * and its existing properties cannot be modified).
         *
         *     var frozenObject = Object.freeze({});
         *
         *     expect(frozenObject).to.be.frozen;
         *     expect({}).to.not.be.frozen;
         *
         * @name frozen
         * @namespace BDD
         * @api public
         */

        Assertion.addProperty('frozen', function() {
            var obj = flag(this, 'object');

            // In ES5, if the argument to this method is not an object (a primitive), then it will cause a TypeError.
            // In ES6, a non-object argument will be treated as if it was a frozen ordinary object, simply return true.
            // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen
            // The following provides ES6 behavior when a TypeError is thrown under ES5.

            var isFrozen;

            try {
                isFrozen = Object.isFrozen(obj);
            } catch (err) {
                if (err instanceof TypeError) isFrozen = true;
                else throw err;
            }

            this.assert(
                isFrozen
                , 'expected #{this} to be frozen'
                , 'expected #{this} to not be frozen'
            );
        });
    };

},{}],6:[function(require,module,exports){
    /*!
     * chai
     * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */


    module.exports = function (chai, util) {

        /*!
         * Chai dependencies.
         */

        var Assertion = chai.Assertion
            , flag = util.flag;

        /*!
         * Module export.
         */

        /**
         * ### assert(expression, message)
         *
         * Write your own test expressions.
         *
         *     assert('foo' !== 'bar', 'foo is not bar');
         *     assert(Array.isArray([]), 'empty arrays are arrays');
         *
         * @param {Mixed} expression to test for truthiness
         * @param {String} message to display on error
         * @name assert
         * @namespace Assert
         * @api public
         */

        var assert = chai.assert = function (express, errmsg) {
            var test = new Assertion(null, null, chai.assert);
            test.assert(
                express
                , errmsg
                , '[ negation message unavailable ]'
            );
        };

        /**
         * ### .fail(actual, expected, [message], [operator])
         *
         * Throw a failure. Node.js `assert` module-compatible.
         *
         * @name fail
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @param {String} operator
         * @namespace Assert
         * @api public
         */

        assert.fail = function (actual, expected, message, operator) {
            message = message || 'assert.fail()';
            throw new chai.AssertionError(message, {
                actual: actual
                , expected: expected
                , operator: operator
            }, assert.fail);
        };

        /**
         * ### .isOk(object, [message])
         *
         * Asserts that `object` is truthy.
         *
         *     assert.isOk('everything', 'everything is ok');
         *     assert.isOk(false, 'this will fail');
         *
         * @name isOk
         * @alias ok
         * @param {Mixed} object to test
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isOk = function (val, msg) {
            new Assertion(val, msg).is.ok;
        };

        /**
         * ### .isNotOk(object, [message])
         *
         * Asserts that `object` is falsy.
         *
         *     assert.isNotOk('everything', 'this will fail');
         *     assert.isNotOk(false, 'this will pass');
         *
         * @name isNotOk
         * @alias notOk
         * @param {Mixed} object to test
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotOk = function (val, msg) {
            new Assertion(val, msg).is.not.ok;
        };

        /**
         * ### .equal(actual, expected, [message])
         *
         * Asserts non-strict equality (`==`) of `actual` and `expected`.
         *
         *     assert.equal(3, '3', '== coerces values to strings');
         *
         * @name equal
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.equal = function (act, exp, msg) {
            var test = new Assertion(act, msg, assert.equal);

            test.assert(
                exp == flag(test, 'object')
                , 'expected #{this} to equal #{exp}'
                , 'expected #{this} to not equal #{act}'
                , exp
                , act
            );
        };

        /**
         * ### .notEqual(actual, expected, [message])
         *
         * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
         *
         *     assert.notEqual(3, 4, 'these numbers are not equal');
         *
         * @name notEqual
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notEqual = function (act, exp, msg) {
            var test = new Assertion(act, msg, assert.notEqual);

            test.assert(
                exp != flag(test, 'object')
                , 'expected #{this} to not equal #{exp}'
                , 'expected #{this} to equal #{act}'
                , exp
                , act
            );
        };

        /**
         * ### .strictEqual(actual, expected, [message])
         *
         * Asserts strict equality (`===`) of `actual` and `expected`.
         *
         *     assert.strictEqual(true, true, 'these booleans are strictly equal');
         *
         * @name strictEqual
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.strictEqual = function (act, exp, msg) {
            new Assertion(act, msg).to.equal(exp);
        };

        /**
         * ### .notStrictEqual(actual, expected, [message])
         *
         * Asserts strict inequality (`!==`) of `actual` and `expected`.
         *
         *     assert.notStrictEqual(3, '3', 'no coercion for strict equality');
         *
         * @name notStrictEqual
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notStrictEqual = function (act, exp, msg) {
            new Assertion(act, msg).to.not.equal(exp);
        };

        /**
         * ### .deepEqual(actual, expected, [message])
         *
         * Asserts that `actual` is deeply equal to `expected`.
         *
         *     assert.deepEqual({ tea: 'green' }, { tea: 'green' });
         *
         * @name deepEqual
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.deepEqual = function (act, exp, msg) {
            new Assertion(act, msg).to.eql(exp);
        };

        /**
         * ### .notDeepEqual(actual, expected, [message])
         *
         * Assert that `actual` is not deeply equal to `expected`.
         *
         *     assert.notDeepEqual({ tea: 'green' }, { tea: 'jasmine' });
         *
         * @name notDeepEqual
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notDeepEqual = function (act, exp, msg) {
            new Assertion(act, msg).to.not.eql(exp);
        };

        /**
         * ### .isAbove(valueToCheck, valueToBeAbove, [message])
         *
         * Asserts `valueToCheck` is strictly greater than (>) `valueToBeAbove`
         *
         *     assert.isAbove(5, 2, '5 is strictly greater than 2');
         *
         * @name isAbove
         * @param {Mixed} valueToCheck
         * @param {Mixed} valueToBeAbove
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isAbove = function (val, abv, msg) {
            new Assertion(val, msg).to.be.above(abv);
        };

        /**
         * ### .isAtLeast(valueToCheck, valueToBeAtLeast, [message])
         *
         * Asserts `valueToCheck` is greater than or equal to (>=) `valueToBeAtLeast`
         *
         *     assert.isAtLeast(5, 2, '5 is greater or equal to 2');
         *     assert.isAtLeast(3, 3, '3 is greater or equal to 3');
         *
         * @name isAtLeast
         * @param {Mixed} valueToCheck
         * @param {Mixed} valueToBeAtLeast
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isAtLeast = function (val, atlst, msg) {
            new Assertion(val, msg).to.be.least(atlst);
        };

        /**
         * ### .isBelow(valueToCheck, valueToBeBelow, [message])
         *
         * Asserts `valueToCheck` is strictly less than (<) `valueToBeBelow`
         *
         *     assert.isBelow(3, 6, '3 is strictly less than 6');
         *
         * @name isBelow
         * @param {Mixed} valueToCheck
         * @param {Mixed} valueToBeBelow
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isBelow = function (val, blw, msg) {
            new Assertion(val, msg).to.be.below(blw);
        };

        /**
         * ### .isAtMost(valueToCheck, valueToBeAtMost, [message])
         *
         * Asserts `valueToCheck` is less than or equal to (<=) `valueToBeAtMost`
         *
         *     assert.isAtMost(3, 6, '3 is less than or equal to 6');
         *     assert.isAtMost(4, 4, '4 is less than or equal to 4');
         *
         * @name isAtMost
         * @param {Mixed} valueToCheck
         * @param {Mixed} valueToBeAtMost
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isAtMost = function (val, atmst, msg) {
            new Assertion(val, msg).to.be.most(atmst);
        };

        /**
         * ### .isTrue(value, [message])
         *
         * Asserts that `value` is true.
         *
         *     var teaServed = true;
         *     assert.isTrue(teaServed, 'the tea has been served');
         *
         * @name isTrue
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isTrue = function (val, msg) {
            new Assertion(val, msg).is['true'];
        };

        /**
         * ### .isNotTrue(value, [message])
         *
         * Asserts that `value` is not true.
         *
         *     var tea = 'tasty chai';
         *     assert.isNotTrue(tea, 'great, time for tea!');
         *
         * @name isNotTrue
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotTrue = function (val, msg) {
            new Assertion(val, msg).to.not.equal(true);
        };

        /**
         * ### .isFalse(value, [message])
         *
         * Asserts that `value` is false.
         *
         *     var teaServed = false;
         *     assert.isFalse(teaServed, 'no tea yet? hmm...');
         *
         * @name isFalse
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isFalse = function (val, msg) {
            new Assertion(val, msg).is['false'];
        };

        /**
         * ### .isNotFalse(value, [message])
         *
         * Asserts that `value` is not false.
         *
         *     var tea = 'tasty chai';
         *     assert.isNotFalse(tea, 'great, time for tea!');
         *
         * @name isNotFalse
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotFalse = function (val, msg) {
            new Assertion(val, msg).to.not.equal(false);
        };

        /**
         * ### .isNull(value, [message])
         *
         * Asserts that `value` is null.
         *
         *     assert.isNull(err, 'there was no error');
         *
         * @name isNull
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNull = function (val, msg) {
            new Assertion(val, msg).to.equal(null);
        };

        /**
         * ### .isNotNull(value, [message])
         *
         * Asserts that `value` is not null.
         *
         *     var tea = 'tasty chai';
         *     assert.isNotNull(tea, 'great, time for tea!');
         *
         * @name isNotNull
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotNull = function (val, msg) {
            new Assertion(val, msg).to.not.equal(null);
        };

        /**
         * ### .isNaN
         * Asserts that value is NaN
         *
         *    assert.isNaN('foo', 'foo is NaN');
         *
         * @name isNaN
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNaN = function (val, msg) {
            new Assertion(val, msg).to.be.NaN;
        };

        /**
         * ### .isNotNaN
         * Asserts that value is not NaN
         *
         *    assert.isNotNaN(4, '4 is not NaN');
         *
         * @name isNotNaN
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */
        assert.isNotNaN = function (val, msg) {
            new Assertion(val, msg).not.to.be.NaN;
        };

        /**
         * ### .isUndefined(value, [message])
         *
         * Asserts that `value` is `undefined`.
         *
         *     var tea;
         *     assert.isUndefined(tea, 'no tea defined');
         *
         * @name isUndefined
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isUndefined = function (val, msg) {
            new Assertion(val, msg).to.equal(undefined);
        };

        /**
         * ### .isDefined(value, [message])
         *
         * Asserts that `value` is not `undefined`.
         *
         *     var tea = 'cup of chai';
         *     assert.isDefined(tea, 'tea has been defined');
         *
         * @name isDefined
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isDefined = function (val, msg) {
            new Assertion(val, msg).to.not.equal(undefined);
        };

        /**
         * ### .isFunction(value, [message])
         *
         * Asserts that `value` is a function.
         *
         *     function serveTea() { return 'cup of tea'; };
         *     assert.isFunction(serveTea, 'great, we can have tea now');
         *
         * @name isFunction
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isFunction = function (val, msg) {
            new Assertion(val, msg).to.be.a('function');
        };

        /**
         * ### .isNotFunction(value, [message])
         *
         * Asserts that `value` is _not_ a function.
         *
         *     var serveTea = [ 'heat', 'pour', 'sip' ];
         *     assert.isNotFunction(serveTea, 'great, we have listed the steps');
         *
         * @name isNotFunction
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotFunction = function (val, msg) {
            new Assertion(val, msg).to.not.be.a('function');
        };

        /**
         * ### .isObject(value, [message])
         *
         * Asserts that `value` is an object of type 'Object' (as revealed by `Object.prototype.toString`).
         * _The assertion does not match subclassed objects._
         *
         *     var selection = { name: 'Chai', serve: 'with spices' };
         *     assert.isObject(selection, 'tea selection is an object');
         *
         * @name isObject
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isObject = function (val, msg) {
            new Assertion(val, msg).to.be.a('object');
        };

        /**
         * ### .isNotObject(value, [message])
         *
         * Asserts that `value` is _not_ an object of type 'Object' (as revealed by `Object.prototype.toString`).
         *
         *     var selection = 'chai'
         *     assert.isNotObject(selection, 'tea selection is not an object');
         *     assert.isNotObject(null, 'null is not an object');
         *
         * @name isNotObject
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotObject = function (val, msg) {
            new Assertion(val, msg).to.not.be.a('object');
        };

        /**
         * ### .isArray(value, [message])
         *
         * Asserts that `value` is an array.
         *
         *     var menu = [ 'green', 'chai', 'oolong' ];
         *     assert.isArray(menu, 'what kind of tea do we want?');
         *
         * @name isArray
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isArray = function (val, msg) {
            new Assertion(val, msg).to.be.an('array');
        };

        /**
         * ### .isNotArray(value, [message])
         *
         * Asserts that `value` is _not_ an array.
         *
         *     var menu = 'green|chai|oolong';
         *     assert.isNotArray(menu, 'what kind of tea do we want?');
         *
         * @name isNotArray
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotArray = function (val, msg) {
            new Assertion(val, msg).to.not.be.an('array');
        };

        /**
         * ### .isString(value, [message])
         *
         * Asserts that `value` is a string.
         *
         *     var teaOrder = 'chai';
         *     assert.isString(teaOrder, 'order placed');
         *
         * @name isString
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isString = function (val, msg) {
            new Assertion(val, msg).to.be.a('string');
        };

        /**
         * ### .isNotString(value, [message])
         *
         * Asserts that `value` is _not_ a string.
         *
         *     var teaOrder = 4;
         *     assert.isNotString(teaOrder, 'order placed');
         *
         * @name isNotString
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotString = function (val, msg) {
            new Assertion(val, msg).to.not.be.a('string');
        };

        /**
         * ### .isNumber(value, [message])
         *
         * Asserts that `value` is a number.
         *
         *     var cups = 2;
         *     assert.isNumber(cups, 'how many cups');
         *
         * @name isNumber
         * @param {Number} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNumber = function (val, msg) {
            new Assertion(val, msg).to.be.a('number');
        };

        /**
         * ### .isNotNumber(value, [message])
         *
         * Asserts that `value` is _not_ a number.
         *
         *     var cups = '2 cups please';
         *     assert.isNotNumber(cups, 'how many cups');
         *
         * @name isNotNumber
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotNumber = function (val, msg) {
            new Assertion(val, msg).to.not.be.a('number');
        };

        /**
         * ### .isBoolean(value, [message])
         *
         * Asserts that `value` is a boolean.
         *
         *     var teaReady = true
         *       , teaServed = false;
         *
         *     assert.isBoolean(teaReady, 'is the tea ready');
         *     assert.isBoolean(teaServed, 'has tea been served');
         *
         * @name isBoolean
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isBoolean = function (val, msg) {
            new Assertion(val, msg).to.be.a('boolean');
        };

        /**
         * ### .isNotBoolean(value, [message])
         *
         * Asserts that `value` is _not_ a boolean.
         *
         *     var teaReady = 'yep'
         *       , teaServed = 'nope';
         *
         *     assert.isNotBoolean(teaReady, 'is the tea ready');
         *     assert.isNotBoolean(teaServed, 'has tea been served');
         *
         * @name isNotBoolean
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.isNotBoolean = function (val, msg) {
            new Assertion(val, msg).to.not.be.a('boolean');
        };

        /**
         * ### .typeOf(value, name, [message])
         *
         * Asserts that `value`'s type is `name`, as determined by
         * `Object.prototype.toString`.
         *
         *     assert.typeOf({ tea: 'chai' }, 'object', 'we have an object');
         *     assert.typeOf(['chai', 'jasmine'], 'array', 'we have an array');
         *     assert.typeOf('tea', 'string', 'we have a string');
         *     assert.typeOf(/tea/, 'regexp', 'we have a regular expression');
         *     assert.typeOf(null, 'null', 'we have a null');
         *     assert.typeOf(undefined, 'undefined', 'we have an undefined');
         *
         * @name typeOf
         * @param {Mixed} value
         * @param {String} name
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.typeOf = function (val, type, msg) {
            new Assertion(val, msg).to.be.a(type);
        };

        /**
         * ### .notTypeOf(value, name, [message])
         *
         * Asserts that `value`'s type is _not_ `name`, as determined by
         * `Object.prototype.toString`.
         *
         *     assert.notTypeOf('tea', 'number', 'strings are not numbers');
         *
         * @name notTypeOf
         * @param {Mixed} value
         * @param {String} typeof name
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notTypeOf = function (val, type, msg) {
            new Assertion(val, msg).to.not.be.a(type);
        };

        /**
         * ### .instanceOf(object, constructor, [message])
         *
         * Asserts that `value` is an instance of `constructor`.
         *
         *     var Tea = function (name) { this.name = name; }
         *       , chai = new Tea('chai');
         *
         *     assert.instanceOf(chai, Tea, 'chai is an instance of tea');
         *
         * @name instanceOf
         * @param {Object} object
         * @param {Constructor} constructor
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.instanceOf = function (val, type, msg) {
            new Assertion(val, msg).to.be.instanceOf(type);
        };

        /**
         * ### .notInstanceOf(object, constructor, [message])
         *
         * Asserts `value` is not an instance of `constructor`.
         *
         *     var Tea = function (name) { this.name = name; }
         *       , chai = new String('chai');
         *
         *     assert.notInstanceOf(chai, Tea, 'chai is not an instance of tea');
         *
         * @name notInstanceOf
         * @param {Object} object
         * @param {Constructor} constructor
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notInstanceOf = function (val, type, msg) {
            new Assertion(val, msg).to.not.be.instanceOf(type);
        };

        /**
         * ### .include(haystack, needle, [message])
         *
         * Asserts that `haystack` includes `needle`. Works
         * for strings and arrays.
         *
         *     assert.include('foobar', 'bar', 'foobar contains string "bar"');
         *     assert.include([ 1, 2, 3 ], 3, 'array contains value');
         *
         * @name include
         * @param {Array|String} haystack
         * @param {Mixed} needle
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.include = function (exp, inc, msg) {
            new Assertion(exp, msg, assert.include).include(inc);
        };

        /**
         * ### .notInclude(haystack, needle, [message])
         *
         * Asserts that `haystack` does not include `needle`. Works
         * for strings and arrays.
         *
         *     assert.notInclude('foobar', 'baz', 'string not include substring');
         *     assert.notInclude([ 1, 2, 3 ], 4, 'array not include contain value');
         *
         * @name notInclude
         * @param {Array|String} haystack
         * @param {Mixed} needle
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notInclude = function (exp, inc, msg) {
            new Assertion(exp, msg, assert.notInclude).not.include(inc);
        };

        /**
         * ### .match(value, regexp, [message])
         *
         * Asserts that `value` matches the regular expression `regexp`.
         *
         *     assert.match('foobar', /^foo/, 'regexp matches');
         *
         * @name match
         * @param {Mixed} value
         * @param {RegExp} regexp
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.match = function (exp, re, msg) {
            new Assertion(exp, msg).to.match(re);
        };

        /**
         * ### .notMatch(value, regexp, [message])
         *
         * Asserts that `value` does not match the regular expression `regexp`.
         *
         *     assert.notMatch('foobar', /^foo/, 'regexp does not match');
         *
         * @name notMatch
         * @param {Mixed} value
         * @param {RegExp} regexp
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notMatch = function (exp, re, msg) {
            new Assertion(exp, msg).to.not.match(re);
        };

        /**
         * ### .property(object, property, [message])
         *
         * Asserts that `object` has a property named by `property`.
         *
         *     assert.property({ tea: { green: 'matcha' }}, 'tea');
         *
         * @name property
         * @param {Object} object
         * @param {String} property
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.property = function (obj, prop, msg) {
            new Assertion(obj, msg).to.have.property(prop);
        };

        /**
         * ### .notProperty(object, property, [message])
         *
         * Asserts that `object` does _not_ have a property named by `property`.
         *
         *     assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
         *
         * @name notProperty
         * @param {Object} object
         * @param {String} property
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notProperty = function (obj, prop, msg) {
            new Assertion(obj, msg).to.not.have.property(prop);
        };

        /**
         * ### .deepProperty(object, property, [message])
         *
         * Asserts that `object` has a property named by `property`, which can be a
         * string using dot- and bracket-notation for deep reference.
         *
         *     assert.deepProperty({ tea: { green: 'matcha' }}, 'tea.green');
         *
         * @name deepProperty
         * @param {Object} object
         * @param {String} property
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.deepProperty = function (obj, prop, msg) {
            new Assertion(obj, msg).to.have.deep.property(prop);
        };

        /**
         * ### .notDeepProperty(object, property, [message])
         *
         * Asserts that `object` does _not_ have a property named by `property`, which
         * can be a string using dot- and bracket-notation for deep reference.
         *
         *     assert.notDeepProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
         *
         * @name notDeepProperty
         * @param {Object} object
         * @param {String} property
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.notDeepProperty = function (obj, prop, msg) {
            new Assertion(obj, msg).to.not.have.deep.property(prop);
        };

        /**
         * ### .propertyVal(object, property, value, [message])
         *
         * Asserts that `object` has a property named by `property` with value given
         * by `value`.
         *
         *     assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
         *
         * @name propertyVal
         * @param {Object} object
         * @param {String} property
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.propertyVal = function (obj, prop, val, msg) {
            new Assertion(obj, msg).to.have.property(prop, val);
        };

        /**
         * ### .propertyNotVal(object, property, value, [message])
         *
         * Asserts that `object` has a property named by `property`, but with a value
         * different from that given by `value`.
         *
         *     assert.propertyNotVal({ tea: 'is good' }, 'tea', 'is bad');
         *
         * @name propertyNotVal
         * @param {Object} object
         * @param {String} property
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.propertyNotVal = function (obj, prop, val, msg) {
            new Assertion(obj, msg).to.not.have.property(prop, val);
        };

        /**
         * ### .deepPropertyVal(object, property, value, [message])
         *
         * Asserts that `object` has a property named by `property` with value given
         * by `value`. `property` can use dot- and bracket-notation for deep
         * reference.
         *
         *     assert.deepPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
         *
         * @name deepPropertyVal
         * @param {Object} object
         * @param {String} property
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.deepPropertyVal = function (obj, prop, val, msg) {
            new Assertion(obj, msg).to.have.deep.property(prop, val);
        };

        /**
         * ### .deepPropertyNotVal(object, property, value, [message])
         *
         * Asserts that `object` has a property named by `property`, but with a value
         * different from that given by `value`. `property` can use dot- and
         * bracket-notation for deep reference.
         *
         *     assert.deepPropertyNotVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
         *
         * @name deepPropertyNotVal
         * @param {Object} object
         * @param {String} property
         * @param {Mixed} value
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.deepPropertyNotVal = function (obj, prop, val, msg) {
            new Assertion(obj, msg).to.not.have.deep.property(prop, val);
        };

        /**
         * ### .lengthOf(object, length, [message])
         *
         * Asserts that `object` has a `length` property with the expected value.
         *
         *     assert.lengthOf([1,2,3], 3, 'array has length of 3');
         *     assert.lengthOf('foobar', 6, 'string has length of 6');
         *
         * @name lengthOf
         * @param {Mixed} object
         * @param {Number} length
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.lengthOf = function (exp, len, msg) {
            new Assertion(exp, msg).to.have.length(len);
        };

        /**
         * ### .throws(function, [constructor/string/regexp], [string/regexp], [message])
         *
         * Asserts that `function` will throw an error that is an instance of
         * `constructor`, or alternately that it will throw an error with message
         * matching `regexp`.
         *
         *     assert.throws(fn, 'function throws a reference error');
         *     assert.throws(fn, /function throws a reference error/);
         *     assert.throws(fn, ReferenceError);
         *     assert.throws(fn, ReferenceError, 'function throws a reference error');
         *     assert.throws(fn, ReferenceError, /function throws a reference error/);
         *
         * @name throws
         * @alias throw
         * @alias Throw
         * @param {Function} function
         * @param {ErrorConstructor} constructor
         * @param {RegExp} regexp
         * @param {String} message
         * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
         * @namespace Assert
         * @api public
         */

        assert.throws = function (fn, errt, errs, msg) {
            if ('string' === typeof errt || errt instanceof RegExp) {
                errs = errt;
                errt = null;
            }

            var assertErr = new Assertion(fn, msg).to.throw(errt, errs);
            return flag(assertErr, 'object');
        };

        /**
         * ### .doesNotThrow(function, [constructor/regexp], [message])
         *
         * Asserts that `function` will _not_ throw an error that is an instance of
         * `constructor`, or alternately that it will not throw an error with message
         * matching `regexp`.
         *
         *     assert.doesNotThrow(fn, Error, 'function does not throw');
         *
         * @name doesNotThrow
         * @param {Function} function
         * @param {ErrorConstructor} constructor
         * @param {RegExp} regexp
         * @param {String} message
         * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
         * @namespace Assert
         * @api public
         */

        assert.doesNotThrow = function (fn, type, msg) {
            if ('string' === typeof type) {
                msg = type;
                type = null;
            }

            new Assertion(fn, msg).to.not.Throw(type);
        };

        /**
         * ### .operator(val1, operator, val2, [message])
         *
         * Compares two values using `operator`.
         *
         *     assert.operator(1, '<', 2, 'everything is ok');
         *     assert.operator(1, '>', 2, 'this will fail');
         *
         * @name operator
         * @param {Mixed} val1
         * @param {String} operator
         * @param {Mixed} val2
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.operator = function (val, operator, val2, msg) {
            var ok;
            switch(operator) {
                case '==':
                    ok = val == val2;
                    break;
                case '===':
                    ok = val === val2;
                    break;
                case '>':
                    ok = val > val2;
                    break;
                case '>=':
                    ok = val >= val2;
                    break;
                case '<':
                    ok = val < val2;
                    break;
                case '<=':
                    ok = val <= val2;
                    break;
                case '!=':
                    ok = val != val2;
                    break;
                case '!==':
                    ok = val !== val2;
                    break;
                default:
                    throw new Error('Invalid operator "' + operator + '"');
            }
            var test = new Assertion(ok, msg);
            test.assert(
                true === flag(test, 'object')
                , 'expected ' + util.inspect(val) + ' to be ' + operator + ' ' + util.inspect(val2)
                , 'expected ' + util.inspect(val) + ' to not be ' + operator + ' ' + util.inspect(val2) );
        };

        /**
         * ### .closeTo(actual, expected, delta, [message])
         *
         * Asserts that the target is equal `expected`, to within a +/- `delta` range.
         *
         *     assert.closeTo(1.5, 1, 0.5, 'numbers are close');
         *
         * @name closeTo
         * @param {Number} actual
         * @param {Number} expected
         * @param {Number} delta
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.closeTo = function (act, exp, delta, msg) {
            new Assertion(act, msg).to.be.closeTo(exp, delta);
        };

        /**
         * ### .approximately(actual, expected, delta, [message])
         *
         * Asserts that the target is equal `expected`, to within a +/- `delta` range.
         *
         *     assert.approximately(1.5, 1, 0.5, 'numbers are close');
         *
         * @name approximately
         * @param {Number} actual
         * @param {Number} expected
         * @param {Number} delta
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.approximately = function (act, exp, delta, msg) {
            new Assertion(act, msg).to.be.approximately(exp, delta);
        };

        /**
         * ### .sameMembers(set1, set2, [message])
         *
         * Asserts that `set1` and `set2` have the same members.
         * Order is not taken into account.
         *
         *     assert.sameMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'same members');
         *
         * @name sameMembers
         * @param {Array} set1
         * @param {Array} set2
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.sameMembers = function (set1, set2, msg) {
            new Assertion(set1, msg).to.have.same.members(set2);
        }

        /**
         * ### .sameDeepMembers(set1, set2, [message])
         *
         * Asserts that `set1` and `set2` have the same members - using a deep equality checking.
         * Order is not taken into account.
         *
         *     assert.sameDeepMembers([ {b: 3}, {a: 2}, {c: 5} ], [ {c: 5}, {b: 3}, {a: 2} ], 'same deep members');
         *
         * @name sameDeepMembers
         * @param {Array} set1
         * @param {Array} set2
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.sameDeepMembers = function (set1, set2, msg) {
            new Assertion(set1, msg).to.have.same.deep.members(set2);
        }

        /**
         * ### .includeMembers(superset, subset, [message])
         *
         * Asserts that `subset` is included in `superset`.
         * Order is not taken into account.
         *
         *     assert.includeMembers([ 1, 2, 3 ], [ 2, 1 ], 'include members');
         *
         * @name includeMembers
         * @param {Array} superset
         * @param {Array} subset
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.includeMembers = function (superset, subset, msg) {
            new Assertion(superset, msg).to.include.members(subset);
        }

        /**
         * ### .includeDeepMembers(superset, subset, [message])
         *
         * Asserts that `subset` is included in `superset` - using deep equality checking.
         * Order is not taken into account.
         * Duplicates are ignored.
         *
         *     assert.includeDeepMembers([ {a: 1}, {b: 2}, {c: 3} ], [ {b: 2}, {a: 1}, {b: 2} ], 'include deep members');
         *
         * @name includeDeepMembers
         * @param {Array} superset
         * @param {Array} subset
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.includeDeepMembers = function (superset, subset, msg) {
            new Assertion(superset, msg).to.include.deep.members(subset);
        }

        /**
         * ### .oneOf(inList, list, [message])
         *
         * Asserts that non-object, non-array value `inList` appears in the flat array `list`.
         *
         *     assert.oneOf(1, [ 2, 1 ], 'Not found in list');
         *
         * @name oneOf
         * @param {*} inList
         * @param {Array<*>} list
         * @param {String} message
         * @namespace Assert
         * @api public
         */

        assert.oneOf = function (inList, list, msg) {
            new Assertion(inList, msg).to.be.oneOf(list);
        }

        /**
         * ### .changes(function, object, property)
         *
         * Asserts that a function changes the value of a property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val = 22 };
         *     assert.changes(fn, obj, 'val');
         *
         * @name changes
         * @param {Function} modifier function
         * @param {Object} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.changes = function (fn, obj, prop) {
            new Assertion(fn).to.change(obj, prop);
        }

        /**
         * ### .doesNotChange(function, object, property)
         *
         * Asserts that a function does not changes the value of a property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { console.log('foo'); };
         *     assert.doesNotChange(fn, obj, 'val');
         *
         * @name doesNotChange
         * @param {Function} modifier function
         * @param {Object} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.doesNotChange = function (fn, obj, prop) {
            new Assertion(fn).to.not.change(obj, prop);
        }

        /**
         * ### .increases(function, object, property)
         *
         * Asserts that a function increases an object property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val = 13 };
         *     assert.increases(fn, obj, 'val');
         *
         * @name increases
         * @param {Function} modifier function
         * @param {Object} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.increases = function (fn, obj, prop) {
            new Assertion(fn).to.increase(obj, prop);
        }

        /**
         * ### .doesNotIncrease(function, object, property)
         *
         * Asserts that a function does not increase object property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val = 8 };
         *     assert.doesNotIncrease(fn, obj, 'val');
         *
         * @name doesNotIncrease
         * @param {Function} modifier function
         * @param {Object} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.doesNotIncrease = function (fn, obj, prop) {
            new Assertion(fn).to.not.increase(obj, prop);
        }

        /**
         * ### .decreases(function, object, property)
         *
         * Asserts that a function decreases an object property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val = 5 };
         *     assert.decreases(fn, obj, 'val');
         *
         * @name decreases
         * @param {Function} modifier function
         * @param {Object} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.decreases = function (fn, obj, prop) {
            new Assertion(fn).to.decrease(obj, prop);
        }

        /**
         * ### .doesNotDecrease(function, object, property)
         *
         * Asserts that a function does not decreases an object property
         *
         *     var obj = { val: 10 };
         *     var fn = function() { obj.val = 15 };
         *     assert.doesNotDecrease(fn, obj, 'val');
         *
         * @name doesNotDecrease
         * @param {Function} modifier function
         * @param {Object} object
         * @param {String} property name
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.doesNotDecrease = function (fn, obj, prop) {
            new Assertion(fn).to.not.decrease(obj, prop);
        }

        /*!
         * ### .ifError(object)
         *
         * Asserts if value is not a false value, and throws if it is a true value.
         * This is added to allow for chai to be a drop-in replacement for Node's
         * assert class.
         *
         *     var err = new Error('I am a custom error');
         *     assert.ifError(err); // Rethrows err!
         *
         * @name ifError
         * @param {Object} object
         * @namespace Assert
         * @api public
         */

        assert.ifError = function (val) {
            if (val) {
                throw(val);
            }
        };

        /**
         * ### .isExtensible(object)
         *
         * Asserts that `object` is extensible (can have new properties added to it).
         *
         *     assert.isExtensible({});
         *
         * @name isExtensible
         * @alias extensible
         * @param {Object} object
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.isExtensible = function (obj, msg) {
            new Assertion(obj, msg).to.be.extensible;
        };

        /**
         * ### .isNotExtensible(object)
         *
         * Asserts that `object` is _not_ extensible.
         *
         *     var nonExtensibleObject = Object.preventExtensions({});
         *     var sealedObject = Object.seal({});
         *     var frozenObject = Object.freese({});
         *
         *     assert.isNotExtensible(nonExtensibleObject);
         *     assert.isNotExtensible(sealedObject);
         *     assert.isNotExtensible(frozenObject);
         *
         * @name isNotExtensible
         * @alias notExtensible
         * @param {Object} object
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.isNotExtensible = function (obj, msg) {
            new Assertion(obj, msg).to.not.be.extensible;
        };

        /**
         * ### .isSealed(object)
         *
         * Asserts that `object` is sealed (cannot have new properties added to it
         * and its existing properties cannot be removed).
         *
         *     var sealedObject = Object.seal({});
         *     var frozenObject = Object.seal({});
         *
         *     assert.isSealed(sealedObject);
         *     assert.isSealed(frozenObject);
         *
         * @name isSealed
         * @alias sealed
         * @param {Object} object
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.isSealed = function (obj, msg) {
            new Assertion(obj, msg).to.be.sealed;
        };

        /**
         * ### .isNotSealed(object)
         *
         * Asserts that `object` is _not_ sealed.
         *
         *     assert.isNotSealed({});
         *
         * @name isNotSealed
         * @alias notSealed
         * @param {Object} object
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.isNotSealed = function (obj, msg) {
            new Assertion(obj, msg).to.not.be.sealed;
        };

        /**
         * ### .isFrozen(object)
         *
         * Asserts that `object` is frozen (cannot have new properties added to it
         * and its existing properties cannot be modified).
         *
         *     var frozenObject = Object.freeze({});
         *     assert.frozen(frozenObject);
         *
         * @name isFrozen
         * @alias frozen
         * @param {Object} object
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.isFrozen = function (obj, msg) {
            new Assertion(obj, msg).to.be.frozen;
        };

        /**
         * ### .isNotFrozen(object)
         *
         * Asserts that `object` is _not_ frozen.
         *
         *     assert.isNotFrozen({});
         *
         * @name isNotFrozen
         * @alias notFrozen
         * @param {Object} object
         * @param {String} message _optional_
         * @namespace Assert
         * @api public
         */

        assert.isNotFrozen = function (obj, msg) {
            new Assertion(obj, msg).to.not.be.frozen;
        };

        /*!
         * Aliases.
         */

        (function alias(name, as){
            assert[as] = assert[name];
            return alias;
        })
        ('isOk', 'ok')
        ('isNotOk', 'notOk')
        ('throws', 'throw')
        ('throws', 'Throw')
        ('isExtensible', 'extensible')
        ('isNotExtensible', 'notExtensible')
        ('isSealed', 'sealed')
        ('isNotSealed', 'notSealed')
        ('isFrozen', 'frozen')
        ('isNotFrozen', 'notFrozen');
    };

},{}],7:[function(require,module,exports){
    /*!
     * chai
     * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    module.exports = function (chai, util) {
        chai.expect = function (val, message) {
            return new chai.Assertion(val, message);
        };

        /**
         * ### .fail(actual, expected, [message], [operator])
         *
         * Throw a failure.
         *
         * @name fail
         * @param {Mixed} actual
         * @param {Mixed} expected
         * @param {String} message
         * @param {String} operator
         * @namespace Expect
         * @api public
         */

        chai.expect.fail = function (actual, expected, message, operator) {
            message = message || 'expect.fail()';
            throw new chai.AssertionError(message, {
                actual: actual
                , expected: expected
                , operator: operator
            }, chai.expect.fail);
        };
    };

},{}],8:[function(require,module,exports){
    /*!
     * chai
     * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    module.exports = function (chai, util) {
        var Assertion = chai.Assertion;

        function loadShould () {
            // explicitly define this method as function as to have it's name to include as `ssfi`
            function shouldGetter() {
                if (this instanceof String || this instanceof Number || this instanceof Boolean ) {
                    return new Assertion(this.valueOf(), null, shouldGetter);
                }
                return new Assertion(this, null, shouldGetter);
            }
            function shouldSetter(value) {
                // See https://github.com/chaijs/chai/issues/86: this makes
                // `whatever.should = someValue` actually set `someValue`, which is
                // especially useful for `global.should = require('chai').should()`.
                //
                // Note that we have to use [[DefineProperty]] instead of [[Put]]
                // since otherwise we would trigger this very setter!
                Object.defineProperty(this, 'should', {
                    value: value,
                    enumerable: true,
                    configurable: true,
                    writable: true
                });
            }
            // modify Object.prototype to have `should`
            Object.defineProperty(Object.prototype, 'should', {
                set: shouldSetter
                , get: shouldGetter
                , configurable: true
            });

            var should = {};

            /**
             * ### .fail(actual, expected, [message], [operator])
             *
             * Throw a failure.
             *
             * @name fail
             * @param {Mixed} actual
             * @param {Mixed} expected
             * @param {String} message
             * @param {String} operator
             * @namespace Should
             * @api public
             */

            should.fail = function (actual, expected, message, operator) {
                message = message || 'should.fail()';
                throw new chai.AssertionError(message, {
                    actual: actual
                    , expected: expected
                    , operator: operator
                }, should.fail);
            };

            /**
             * ### .equal(actual, expected, [message])
             *
             * Asserts non-strict equality (`==`) of `actual` and `expected`.
             *
             *     should.equal(3, '3', '== coerces values to strings');
             *
             * @name equal
             * @param {Mixed} actual
             * @param {Mixed} expected
             * @param {String} message
             * @namespace Should
             * @api public
             */

            should.equal = function (val1, val2, msg) {
                new Assertion(val1, msg).to.equal(val2);
            };

            /**
             * ### .throw(function, [constructor/string/regexp], [string/regexp], [message])
             *
             * Asserts that `function` will throw an error that is an instance of
             * `constructor`, or alternately that it will throw an error with message
             * matching `regexp`.
             *
             *     should.throw(fn, 'function throws a reference error');
             *     should.throw(fn, /function throws a reference error/);
             *     should.throw(fn, ReferenceError);
             *     should.throw(fn, ReferenceError, 'function throws a reference error');
             *     should.throw(fn, ReferenceError, /function throws a reference error/);
             *
             * @name throw
             * @alias Throw
             * @param {Function} function
             * @param {ErrorConstructor} constructor
             * @param {RegExp} regexp
             * @param {String} message
             * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
             * @namespace Should
             * @api public
             */

            should.Throw = function (fn, errt, errs, msg) {
                new Assertion(fn, msg).to.Throw(errt, errs);
            };

            /**
             * ### .exist
             *
             * Asserts that the target is neither `null` nor `undefined`.
             *
             *     var foo = 'hi';
             *
             *     should.exist(foo, 'foo exists');
             *
             * @name exist
             * @namespace Should
             * @api public
             */

            should.exist = function (val, msg) {
                new Assertion(val, msg).to.exist;
            }

            // negation
            should.not = {}

            /**
             * ### .not.equal(actual, expected, [message])
             *
             * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
             *
             *     should.not.equal(3, 4, 'these numbers are not equal');
             *
             * @name not.equal
             * @param {Mixed} actual
             * @param {Mixed} expected
             * @param {String} message
             * @namespace Should
             * @api public
             */

            should.not.equal = function (val1, val2, msg) {
                new Assertion(val1, msg).to.not.equal(val2);
            };

            /**
             * ### .throw(function, [constructor/regexp], [message])
             *
             * Asserts that `function` will _not_ throw an error that is an instance of
             * `constructor`, or alternately that it will not throw an error with message
             * matching `regexp`.
             *
             *     should.not.throw(fn, Error, 'function does not throw');
             *
             * @name not.throw
             * @alias not.Throw
             * @param {Function} function
             * @param {ErrorConstructor} constructor
             * @param {RegExp} regexp
             * @param {String} message
             * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
             * @namespace Should
             * @api public
             */

            should.not.Throw = function (fn, errt, errs, msg) {
                new Assertion(fn, msg).to.not.Throw(errt, errs);
            };

            /**
             * ### .not.exist
             *
             * Asserts that the target is neither `null` nor `undefined`.
             *
             *     var bar = null;
             *
             *     should.not.exist(bar, 'bar does not exist');
             *
             * @name not.exist
             * @namespace Should
             * @api public
             */

            should.not.exist = function (val, msg) {
                new Assertion(val, msg).to.not.exist;
            }

            should['throw'] = should['Throw'];
            should.not['throw'] = should.not['Throw'];

            return should;
        };

        chai.should = loadShould;
        chai.Should = loadShould;
    };

},{}],9:[function(require,module,exports){
    /*!
     * Chai - addChainingMethod utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Module dependencies
     */

    var transferFlags = require('./transferFlags');
    var flag = require('./flag');
    var config = require('../config');

    /*!
     * Module variables
     */

    // Check whether `__proto__` is supported
    var hasProtoSupport = '__proto__' in Object;

    // Without `__proto__` support, this module will need to add properties to a function.
    // However, some Function.prototype methods cannot be overwritten,
    // and there seems no easy cross-platform way to detect them (@see chaijs/chai/issues/69).
    var excludeNames = /^(?:length|name|arguments|caller)$/;

    // Cache `Function` properties
    var call  = Function.prototype.call,
        apply = Function.prototype.apply;

    /**
     * ### addChainableMethod (ctx, name, method, chainingBehavior)
     *
     * Adds a method to an object, such that the method can also be chained.
     *
     *     utils.addChainableMethod(chai.Assertion.prototype, 'foo', function (str) {
 *       var obj = utils.flag(this, 'object');
 *       new chai.Assertion(obj).to.be.equal(str);
 *     });
     *
     * Can also be accessed directly from `chai.Assertion`.
     *
     *     chai.Assertion.addChainableMethod('foo', fn, chainingBehavior);
     *
     * The result can then be used as both a method assertion, executing both `method` and
     * `chainingBehavior`, or as a language chain, which only executes `chainingBehavior`.
     *
     *     expect(fooStr).to.be.foo('bar');
     *     expect(fooStr).to.be.foo.equal('foo');
     *
     * @param {Object} ctx object to which the method is added
     * @param {String} name of method to add
     * @param {Function} method function to be used for `name`, when called
     * @param {Function} chainingBehavior function to be called every time the property is accessed
     * @namespace Utils
     * @name addChainableMethod
     * @api public
     */

    module.exports = function (ctx, name, method, chainingBehavior) {
        if (typeof chainingBehavior !== 'function') {
            chainingBehavior = function () { };
        }

        var chainableBehavior = {
            method: method
            , chainingBehavior: chainingBehavior
        };

        // save the methods so we can overwrite them later, if we need to.
        if (!ctx.__methods) {
            ctx.__methods = {};
        }
        ctx.__methods[name] = chainableBehavior;

        Object.defineProperty(ctx, name,
            { get: function () {
                chainableBehavior.chainingBehavior.call(this);

                var assert = function assert() {
                    var old_ssfi = flag(this, 'ssfi');
                    if (old_ssfi && config.includeStack === false)
                        flag(this, 'ssfi', assert);
                    var result = chainableBehavior.method.apply(this, arguments);
                    return result === undefined ? this : result;
                };

                // Use `__proto__` if available
                if (hasProtoSupport) {
                    // Inherit all properties from the object by replacing the `Function` prototype
                    var prototype = assert.__proto__ = Object.create(this);
                    // Restore the `call` and `apply` methods from `Function`
                    prototype.call = call;
                    prototype.apply = apply;
                }
                // Otherwise, redefine all properties (slow!)
                else {
                    var asserterNames = Object.getOwnPropertyNames(ctx);
                    asserterNames.forEach(function (asserterName) {
                        if (!excludeNames.test(asserterName)) {
                            var pd = Object.getOwnPropertyDescriptor(ctx, asserterName);
                            Object.defineProperty(assert, asserterName, pd);
                        }
                    });
                }

                transferFlags(this, assert);
                return assert;
            }
                , configurable: true
            });
    };

},{"../config":4,"./flag":13,"./transferFlags":29}],10:[function(require,module,exports){
    /*!
     * Chai - addMethod utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    var config = require('../config');

    /**
     * ### .addMethod (ctx, name, method)
     *
     * Adds a method to the prototype of an object.
     *
     *     utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
 *       var obj = utils.flag(this, 'object');
 *       new chai.Assertion(obj).to.be.equal(str);
 *     });
     *
     * Can also be accessed directly from `chai.Assertion`.
     *
     *     chai.Assertion.addMethod('foo', fn);
     *
     * Then can be used as any other assertion.
     *
     *     expect(fooStr).to.be.foo('bar');
     *
     * @param {Object} ctx object to which the method is added
     * @param {String} name of method to add
     * @param {Function} method function to be used for name
     * @namespace Utils
     * @name addMethod
     * @api public
     */
    var flag = require('./flag');

    module.exports = function (ctx, name, method) {
        ctx[name] = function () {
            var old_ssfi = flag(this, 'ssfi');
            if (old_ssfi && config.includeStack === false)
                flag(this, 'ssfi', ctx[name]);
            var result = method.apply(this, arguments);
            return result === undefined ? this : result;
        };
    };

},{"../config":4,"./flag":13}],11:[function(require,module,exports){
    /*!
     * Chai - addProperty utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    var config = require('../config');
    var flag = require('./flag');

    /**
     * ### addProperty (ctx, name, getter)
     *
     * Adds a property to the prototype of an object.
     *
     *     utils.addProperty(chai.Assertion.prototype, 'foo', function () {
 *       var obj = utils.flag(this, 'object');
 *       new chai.Assertion(obj).to.be.instanceof(Foo);
 *     });
     *
     * Can also be accessed directly from `chai.Assertion`.
     *
     *     chai.Assertion.addProperty('foo', fn);
     *
     * Then can be used as any other assertion.
     *
     *     expect(myFoo).to.be.foo;
     *
     * @param {Object} ctx object to which the property is added
     * @param {String} name of property to add
     * @param {Function} getter function to be used for name
     * @namespace Utils
     * @name addProperty
     * @api public
     */

    module.exports = function (ctx, name, getter) {
        Object.defineProperty(ctx, name,
            { get: function addProperty() {
                var old_ssfi = flag(this, 'ssfi');
                if (old_ssfi && config.includeStack === false)
                    flag(this, 'ssfi', addProperty);

                var result = getter.call(this);
                return result === undefined ? this : result;
            }
                , configurable: true
            });
    };

},{"../config":4,"./flag":13}],12:[function(require,module,exports){
    /*!
     * Chai - expectTypes utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### expectTypes(obj, types)
     *
     * Ensures that the object being tested against is of a valid type.
     *
     *     utils.expectTypes(this, ['array', 'object', 'string']);
     *
     * @param {Mixed} obj constructed Assertion
     * @param {Array} type A list of allowed types for this assertion
     * @namespace Utils
     * @name expectTypes
     * @api public
     */

    var AssertionError = require('assertion-error');
    var flag = require('./flag');
    var type = require('type-detect');

    module.exports = function (obj, types) {
        var obj = flag(obj, 'object');
        types = types.map(function (t) { return t.toLowerCase(); });
        types.sort();

        // Transforms ['lorem', 'ipsum'] into 'a lirum, or an ipsum'
        var str = types.map(function (t, index) {
            var art = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(t.charAt(0)) ? 'an' : 'a';
            var or = types.length > 1 && index === types.length - 1 ? 'or ' : '';
            return or + art + ' ' + t;
        }).join(', ');

        if (!types.some(function (expected) { return type(obj) === expected; })) {
            throw new AssertionError(
                'object tested must be ' + str + ', but ' + type(obj) + ' given'
            );
        }
    };

},{"./flag":13,"assertion-error":30,"type-detect":35}],13:[function(require,module,exports){
    /*!
     * Chai - flag utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### flag(object, key, [value])
     *
     * Get or set a flag value on an object. If a
     * value is provided it will be set, else it will
     * return the currently set value or `undefined` if
     * the value is not set.
     *
     *     utils.flag(this, 'foo', 'bar'); // setter
     *     utils.flag(this, 'foo'); // getter, returns `bar`
     *
     * @param {Object} object constructed Assertion
     * @param {String} key
     * @param {Mixed} value (optional)
     * @namespace Utils
     * @name flag
     * @api private
     */

    module.exports = function (obj, key, value) {
        var flags = obj.__flags || (obj.__flags = Object.create(null));
        if (arguments.length === 3) {
            flags[key] = value;
        } else {
            return flags[key];
        }
    };

},{}],14:[function(require,module,exports){
    /*!
     * Chai - getActual utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * # getActual(object, [actual])
     *
     * Returns the `actual` value for an Assertion
     *
     * @param {Object} object (constructed Assertion)
     * @param {Arguments} chai.Assertion.prototype.assert arguments
     * @namespace Utils
     * @name getActual
     */

    module.exports = function (obj, args) {
        return args.length > 4 ? args[4] : obj._obj;
    };

},{}],15:[function(require,module,exports){
    /*!
     * Chai - getEnumerableProperties utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### .getEnumerableProperties(object)
     *
     * This allows the retrieval of enumerable property names of an object,
     * inherited or not.
     *
     * @param {Object} object
     * @returns {Array}
     * @namespace Utils
     * @name getEnumerableProperties
     * @api public
     */

    module.exports = function getEnumerableProperties(object) {
        var result = [];
        for (var name in object) {
            result.push(name);
        }
        return result;
    };

},{}],16:[function(require,module,exports){
    /*!
     * Chai - message composition utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Module dependancies
     */

    var flag = require('./flag')
        , getActual = require('./getActual')
        , inspect = require('./inspect')
        , objDisplay = require('./objDisplay');

    /**
     * ### .getMessage(object, message, negateMessage)
     *
     * Construct the error message based on flags
     * and template tags. Template tags will return
     * a stringified inspection of the object referenced.
     *
     * Message template tags:
     * - `#{this}` current asserted object
     * - `#{act}` actual value
     * - `#{exp}` expected value
     *
     * @param {Object} object (constructed Assertion)
     * @param {Arguments} chai.Assertion.prototype.assert arguments
     * @namespace Utils
     * @name getMessage
     * @api public
     */

    module.exports = function (obj, args) {
        var negate = flag(obj, 'negate')
            , val = flag(obj, 'object')
            , expected = args[3]
            , actual = getActual(obj, args)
            , msg = negate ? args[2] : args[1]
            , flagMsg = flag(obj, 'message');

        if(typeof msg === "function") msg = msg();
        msg = msg || '';
        msg = msg
            .replace(/#\{this\}/g, function () { return objDisplay(val); })
            .replace(/#\{act\}/g, function () { return objDisplay(actual); })
            .replace(/#\{exp\}/g, function () { return objDisplay(expected); });

        return flagMsg ? flagMsg + ': ' + msg : msg;
    };

},{"./flag":13,"./getActual":14,"./inspect":23,"./objDisplay":24}],17:[function(require,module,exports){
    /*!
     * Chai - getName utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * # getName(func)
     *
     * Gets the name of a function, in a cross-browser way.
     *
     * @param {Function} a function (usually a constructor)
     * @namespace Utils
     * @name getName
     */

    module.exports = function (func) {
        if (func.name) return func.name;

        var match = /^\s?function ([^(]*)\(/.exec(func);
        return match && match[1] ? match[1] : "";
    };

},{}],18:[function(require,module,exports){
    /*!
     * Chai - getPathInfo utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    var hasProperty = require('./hasProperty');

    /**
     * ### .getPathInfo(path, object)
     *
     * This allows the retrieval of property info in an
     * object given a string path.
     *
     * The path info consists of an object with the
     * following properties:
     *
     * * parent - The parent object of the property referenced by `path`
     * * name - The name of the final property, a number if it was an array indexer
     * * value - The value of the property, if it exists, otherwise `undefined`
     * * exists - Whether the property exists or not
     *
     * @param {String} path
     * @param {Object} object
     * @returns {Object} info
     * @namespace Utils
     * @name getPathInfo
     * @api public
     */

    module.exports = function getPathInfo(path, obj) {
        var parsed = parsePath(path),
            last = parsed[parsed.length - 1];

        var info = {
            parent: parsed.length > 1 ? _getPathValue(parsed, obj, parsed.length - 1) : obj,
            name: last.p || last.i,
            value: _getPathValue(parsed, obj)
        };
        info.exists = hasProperty(info.name, info.parent);

        return info;
    };


    /*!
     * ## parsePath(path)
     *
     * Helper function used to parse string object
     * paths. Use in conjunction with `_getPathValue`.
     *
     *      var parsed = parsePath('myobject.property.subprop');
     *
     * ### Paths:
     *
     * * Can be as near infinitely deep and nested
     * * Arrays are also valid using the formal `myobject.document[3].property`.
     * * Literal dots and brackets (not delimiter) must be backslash-escaped.
     *
     * @param {String} path
     * @returns {Object} parsed
     * @api private
     */

    function parsePath (path) {
        var str = path.replace(/([^\\])\[/g, '$1.[')
            , parts = str.match(/(\\\.|[^.]+?)+/g);
        return parts.map(function (value) {
            var re = /^\[(\d+)\]$/
                , mArr = re.exec(value);
            if (mArr) return { i: parseFloat(mArr[1]) };
            else return { p: value.replace(/\\([.\[\]])/g, '$1') };
        });
    }


    /*!
     * ## _getPathValue(parsed, obj)
     *
     * Helper companion function for `.parsePath` that returns
     * the value located at the parsed address.
     *
     *      var value = getPathValue(parsed, obj);
     *
     * @param {Object} parsed definition from `parsePath`.
     * @param {Object} object to search against
     * @param {Number} object to search against
     * @returns {Object|Undefined} value
     * @api private
     */

    function _getPathValue (parsed, obj, index) {
        var tmp = obj
            , res;

        index = (index === undefined ? parsed.length : index);

        for (var i = 0, l = index; i < l; i++) {
            var part = parsed[i];
            if (tmp) {
                if ('undefined' !== typeof part.p)
                    tmp = tmp[part.p];
                else if ('undefined' !== typeof part.i)
                    tmp = tmp[part.i];
                if (i == (l - 1)) res = tmp;
            } else {
                res = undefined;
            }
        }
        return res;
    }

},{"./hasProperty":21}],19:[function(require,module,exports){
    /*!
     * Chai - getPathValue utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * @see https://github.com/logicalparadox/filtr
     * MIT Licensed
     */

    var getPathInfo = require('./getPathInfo');

    /**
     * ### .getPathValue(path, object)
     *
     * This allows the retrieval of values in an
     * object given a string path.
     *
     *     var obj = {
 *         prop1: {
 *             arr: ['a', 'b', 'c']
 *           , str: 'Hello'
 *         }
 *       , prop2: {
 *             arr: [ { nested: 'Universe' } ]
 *           , str: 'Hello again!'
 *         }
 *     }
     *
     * The following would be the results.
     *
     *     getPathValue('prop1.str', obj); // Hello
     *     getPathValue('prop1.att[2]', obj); // b
     *     getPathValue('prop2.arr[0].nested', obj); // Universe
     *
     * @param {String} path
     * @param {Object} object
     * @returns {Object} value or `undefined`
     * @namespace Utils
     * @name getPathValue
     * @api public
     */
    module.exports = function(path, obj) {
        var info = getPathInfo(path, obj);
        return info.value;
    };

},{"./getPathInfo":18}],20:[function(require,module,exports){
    /*!
     * Chai - getProperties utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### .getProperties(object)
     *
     * This allows the retrieval of property names of an object, enumerable or not,
     * inherited or not.
     *
     * @param {Object} object
     * @returns {Array}
     * @namespace Utils
     * @name getProperties
     * @api public
     */

    module.exports = function getProperties(object) {
        var result = Object.getOwnPropertyNames(object);

        function addProperty(property) {
            if (result.indexOf(property) === -1) {
                result.push(property);
            }
        }

        var proto = Object.getPrototypeOf(object);
        while (proto !== null) {
            Object.getOwnPropertyNames(proto).forEach(addProperty);
            proto = Object.getPrototypeOf(proto);
        }

        return result;
    };

},{}],21:[function(require,module,exports){
    /*!
     * Chai - hasProperty utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    var type = require('type-detect');

    /**
     * ### .hasProperty(object, name)
     *
     * This allows checking whether an object has
     * named property or numeric array index.
     *
     * Basically does the same thing as the `in`
     * operator but works properly with natives
     * and null/undefined values.
     *
     *     var obj = {
 *         arr: ['a', 'b', 'c']
 *       , str: 'Hello'
 *     }
     *
     * The following would be the results.
     *
     *     hasProperty('str', obj);  // true
     *     hasProperty('constructor', obj);  // true
     *     hasProperty('bar', obj);  // false
     *
     *     hasProperty('length', obj.str); // true
     *     hasProperty(1, obj.str);  // true
     *     hasProperty(5, obj.str);  // false
     *
     *     hasProperty('length', obj.arr);  // true
     *     hasProperty(2, obj.arr);  // true
     *     hasProperty(3, obj.arr);  // false
     *
     * @param {Objuect} object
     * @param {String|Number} name
     * @returns {Boolean} whether it exists
     * @namespace Utils
     * @name getPathInfo
     * @api public
     */

    var literals = {
        'number': Number
        , 'string': String
    };

    module.exports = function hasProperty(name, obj) {
        var ot = type(obj);

        // Bad Object, obviously no props at all
        if(ot === 'null' || ot === 'undefined')
            return false;

        // The `in` operator does not work with certain literals
        // box these before the check
        if(literals[ot] && typeof obj !== 'object')
            obj = new literals[ot](obj);

        return name in obj;
    };

},{"type-detect":35}],22:[function(require,module,exports){
    /*!
     * chai
     * Copyright(c) 2011 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Main exports
     */

    var exports = module.exports = {};

    /*!
     * test utility
     */

    exports.test = require('./test');

    /*!
     * type utility
     */

    exports.type = require('type-detect');

    /*!
     * expectTypes utility
     */
    exports.expectTypes = require('./expectTypes');

    /*!
     * message utility
     */

    exports.getMessage = require('./getMessage');

    /*!
     * actual utility
     */

    exports.getActual = require('./getActual');

    /*!
     * Inspect util
     */

    exports.inspect = require('./inspect');

    /*!
     * Object Display util
     */

    exports.objDisplay = require('./objDisplay');

    /*!
     * Flag utility
     */

    exports.flag = require('./flag');

    /*!
     * Flag transferring utility
     */

    exports.transferFlags = require('./transferFlags');

    /*!
     * Deep equal utility
     */

    exports.eql = require('deep-eql');

    /*!
     * Deep path value
     */

    exports.getPathValue = require('./getPathValue');

    /*!
     * Deep path info
     */

    exports.getPathInfo = require('./getPathInfo');

    /*!
     * Check if a property exists
     */

    exports.hasProperty = require('./hasProperty');

    /*!
     * Function name
     */

    exports.getName = require('./getName');

    /*!
     * add Property
     */

    exports.addProperty = require('./addProperty');

    /*!
     * add Method
     */

    exports.addMethod = require('./addMethod');

    /*!
     * overwrite Property
     */

    exports.overwriteProperty = require('./overwriteProperty');

    /*!
     * overwrite Method
     */

    exports.overwriteMethod = require('./overwriteMethod');

    /*!
     * Add a chainable method
     */

    exports.addChainableMethod = require('./addChainableMethod');

    /*!
     * Overwrite chainable method
     */

    exports.overwriteChainableMethod = require('./overwriteChainableMethod');

},{"./addChainableMethod":9,"./addMethod":10,"./addProperty":11,"./expectTypes":12,"./flag":13,"./getActual":14,"./getMessage":16,"./getName":17,"./getPathInfo":18,"./getPathValue":19,"./hasProperty":21,"./inspect":23,"./objDisplay":24,"./overwriteChainableMethod":25,"./overwriteMethod":26,"./overwriteProperty":27,"./test":28,"./transferFlags":29,"deep-eql":31,"type-detect":35}],23:[function(require,module,exports){
    // This is (almost) directly from Node.js utils
    // https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js

    var getName = require('./getName');
    var getProperties = require('./getProperties');
    var getEnumerableProperties = require('./getEnumerableProperties');

    module.exports = inspect;

    /**
     * Echos the value of a value. Trys to print the value out
     * in the best way possible given the different types.
     *
     * @param {Object} obj The object to print out.
     * @param {Boolean} showHidden Flag that shows hidden (not enumerable)
     *    properties of objects.
     * @param {Number} depth Depth in which to descend in object. Default is 2.
     * @param {Boolean} colors Flag to turn on ANSI escape codes to color the
     *    output. Default is false (no coloring).
     * @namespace Utils
     * @name inspect
     */
    function inspect(obj, showHidden, depth, colors) {
        var ctx = {
            showHidden: showHidden,
            seen: [],
            stylize: function (str) { return str; }
        };
        return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth));
    }

    // Returns true if object is a DOM element.
    var isDOMElement = function (object) {
        if (typeof HTMLElement === 'object') {
            return object instanceof HTMLElement;
        } else {
            return object &&
                typeof object === 'object' &&
                object.nodeType === 1 &&
                typeof object.nodeName === 'string';
        }
    };

    function formatValue(ctx, value, recurseTimes) {
        // Provide a hook for user-specified inspect functions.
        // Check that value is an object with an inspect function on it
        if (value && typeof value.inspect === 'function' &&
            // Filter out the util module, it's inspect function is special
            value.inspect !== exports.inspect &&
            // Also filter out any prototype objects using the circular check.
            !(value.constructor && value.constructor.prototype === value)) {
            var ret = value.inspect(recurseTimes);
            if (typeof ret !== 'string') {
                ret = formatValue(ctx, ret, recurseTimes);
            }
            return ret;
        }

        // Primitive types cannot have properties
        var primitive = formatPrimitive(ctx, value);
        if (primitive) {
            return primitive;
        }

        // If this is a DOM element, try to get the outer HTML.
        if (isDOMElement(value)) {
            if ('outerHTML' in value) {
                return value.outerHTML;
                // This value does not have an outerHTML attribute,
                //   it could still be an XML element
            } else {
                // Attempt to serialize it
                try {
                    if (document.xmlVersion) {
                        var xmlSerializer = new XMLSerializer();
                        return xmlSerializer.serializeToString(value);
                    } else {
                        // Firefox 11- do not support outerHTML
                        //   It does, however, support innerHTML
                        //   Use the following to render the element
                        var ns = "http://www.w3.org/1999/xhtml";
                        var container = document.createElementNS(ns, '_');

                        container.appendChild(value.cloneNode(false));
                        html = container.innerHTML
                            .replace('><', '>' + value.innerHTML + '<');
                        container.innerHTML = '';
                        return html;
                    }
                } catch (err) {
                    // This could be a non-native DOM implementation,
                    //   continue with the normal flow:
                    //   printing the element as if it is an object.
                }
            }
        }

        // Look up the keys of the object.
        var visibleKeys = getEnumerableProperties(value);
        var keys = ctx.showHidden ? getProperties(value) : visibleKeys;

        // Some type of object without properties can be shortcutted.
        // In IE, errors have a single `stack` property, or if they are vanilla `Error`,
        // a `stack` plus `description` property; ignore those for consistency.
        if (keys.length === 0 || (isError(value) && (
                (keys.length === 1 && keys[0] === 'stack') ||
                (keys.length === 2 && keys[0] === 'description' && keys[1] === 'stack')
            ))) {
            if (typeof value === 'function') {
                var name = getName(value);
                var nameSuffix = name ? ': ' + name : '';
                return ctx.stylize('[Function' + nameSuffix + ']', 'special');
            }
            if (isRegExp(value)) {
                return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
            }
            if (isDate(value)) {
                return ctx.stylize(Date.prototype.toUTCString.call(value), 'date');
            }
            if (isError(value)) {
                return formatError(value);
            }
        }

        var base = '', array = false, braces = ['{', '}'];

        // Make Array say that they are Array
        if (isArray(value)) {
            array = true;
            braces = ['[', ']'];
        }

        // Make functions say that they are functions
        if (typeof value === 'function') {
            var name = getName(value);
            var nameSuffix = name ? ': ' + name : '';
            base = ' [Function' + nameSuffix + ']';
        }

        // Make RegExps say that they are RegExps
        if (isRegExp(value)) {
            base = ' ' + RegExp.prototype.toString.call(value);
        }

        // Make dates with properties first say the date
        if (isDate(value)) {
            base = ' ' + Date.prototype.toUTCString.call(value);
        }

        // Make error with message first say the error
        if (isError(value)) {
            return formatError(value);
        }

        if (keys.length === 0 && (!array || value.length == 0)) {
            return braces[0] + base + braces[1];
        }

        if (recurseTimes < 0) {
            if (isRegExp(value)) {
                return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
            } else {
                return ctx.stylize('[Object]', 'special');
            }
        }

        ctx.seen.push(value);

        var output;
        if (array) {
            output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
        } else {
            output = keys.map(function(key) {
                return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
            });
        }

        ctx.seen.pop();

        return reduceToSingleString(output, base, braces);
    }


    function formatPrimitive(ctx, value) {
        switch (typeof value) {
            case 'undefined':
                return ctx.stylize('undefined', 'undefined');

            case 'string':
                var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                        .replace(/'/g, "\\'")
                        .replace(/\\"/g, '"') + '\'';
                return ctx.stylize(simple, 'string');

            case 'number':
                if (value === 0 && (1/value) === -Infinity) {
                    return ctx.stylize('-0', 'number');
                }
                return ctx.stylize('' + value, 'number');

            case 'boolean':
                return ctx.stylize('' + value, 'boolean');
        }
        // For some reason typeof null is "object", so special case here.
        if (value === null) {
            return ctx.stylize('null', 'null');
        }
    }


    function formatError(value) {
        return '[' + Error.prototype.toString.call(value) + ']';
    }


    function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
        var output = [];
        for (var i = 0, l = value.length; i < l; ++i) {
            if (Object.prototype.hasOwnProperty.call(value, String(i))) {
                output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
                    String(i), true));
            } else {
                output.push('');
            }
        }
        keys.forEach(function(key) {
            if (!key.match(/^\d+$/)) {
                output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
                    key, true));
            }
        });
        return output;
    }


    function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
        var name, str;
        if (value.__lookupGetter__) {
            if (value.__lookupGetter__(key)) {
                if (value.__lookupSetter__(key)) {
                    str = ctx.stylize('[Getter/Setter]', 'special');
                } else {
                    str = ctx.stylize('[Getter]', 'special');
                }
            } else {
                if (value.__lookupSetter__(key)) {
                    str = ctx.stylize('[Setter]', 'special');
                }
            }
        }
        if (visibleKeys.indexOf(key) < 0) {
            name = '[' + key + ']';
        }
        if (!str) {
            if (ctx.seen.indexOf(value[key]) < 0) {
                if (recurseTimes === null) {
                    str = formatValue(ctx, value[key], null);
                } else {
                    str = formatValue(ctx, value[key], recurseTimes - 1);
                }
                if (str.indexOf('\n') > -1) {
                    if (array) {
                        str = str.split('\n').map(function(line) {
                            return '  ' + line;
                        }).join('\n').substr(2);
                    } else {
                        str = '\n' + str.split('\n').map(function(line) {
                                return '   ' + line;
                            }).join('\n');
                    }
                }
            } else {
                str = ctx.stylize('[Circular]', 'special');
            }
        }
        if (typeof name === 'undefined') {
            if (array && key.match(/^\d+$/)) {
                return str;
            }
            name = JSON.stringify('' + key);
            if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
                name = name.substr(1, name.length - 2);
                name = ctx.stylize(name, 'name');
            } else {
                name = name.replace(/'/g, "\\'")
                    .replace(/\\"/g, '"')
                    .replace(/(^"|"$)/g, "'");
                name = ctx.stylize(name, 'string');
            }
        }

        return name + ': ' + str;
    }


    function reduceToSingleString(output, base, braces) {
        var numLinesEst = 0;
        var length = output.reduce(function(prev, cur) {
            numLinesEst++;
            if (cur.indexOf('\n') >= 0) numLinesEst++;
            return prev + cur.length + 1;
        }, 0);

        if (length > 60) {
            return braces[0] +
                (base === '' ? '' : base + '\n ') +
                ' ' +
                output.join(',\n  ') +
                ' ' +
                braces[1];
        }

        return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
    }

    function isArray(ar) {
        return Array.isArray(ar) ||
            (typeof ar === 'object' && objectToString(ar) === '[object Array]');
    }

    function isRegExp(re) {
        return typeof re === 'object' && objectToString(re) === '[object RegExp]';
    }

    function isDate(d) {
        return typeof d === 'object' && objectToString(d) === '[object Date]';
    }

    function isError(e) {
        return typeof e === 'object' && objectToString(e) === '[object Error]';
    }

    function objectToString(o) {
        return Object.prototype.toString.call(o);
    }

},{"./getEnumerableProperties":15,"./getName":17,"./getProperties":20}],24:[function(require,module,exports){
    /*!
     * Chai - flag utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Module dependancies
     */

    var inspect = require('./inspect');
    var config = require('../config');

    /**
     * ### .objDisplay (object)
     *
     * Determines if an object or an array matches
     * criteria to be inspected in-line for error
     * messages or should be truncated.
     *
     * @param {Mixed} javascript object to inspect
     * @name objDisplay
     * @namespace Utils
     * @api public
     */

    module.exports = function (obj) {
        var str = inspect(obj)
            , type = Object.prototype.toString.call(obj);

        if (config.truncateThreshold && str.length >= config.truncateThreshold) {
            if (type === '[object Function]') {
                return !obj.name || obj.name === ''
                    ? '[Function]'
                    : '[Function: ' + obj.name + ']';
            } else if (type === '[object Array]') {
                return '[ Array(' + obj.length + ') ]';
            } else if (type === '[object Object]') {
                var keys = Object.keys(obj)
                    , kstr = keys.length > 2
                    ? keys.splice(0, 2).join(', ') + ', ...'
                    : keys.join(', ');
                return '{ Object (' + kstr + ') }';
            } else {
                return str;
            }
        } else {
            return str;
        }
    };

},{"../config":4,"./inspect":23}],25:[function(require,module,exports){
    /*!
     * Chai - overwriteChainableMethod utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### overwriteChainableMethod (ctx, name, method, chainingBehavior)
     *
     * Overwites an already existing chainable method
     * and provides access to the previous function or
     * property.  Must return functions to be used for
     * name.
     *
     *     utils.overwriteChainableMethod(chai.Assertion.prototype, 'length',
     *       function (_super) {
 *       }
     *     , function (_super) {
 *       }
     *     );
     *
     * Can also be accessed directly from `chai.Assertion`.
     *
     *     chai.Assertion.overwriteChainableMethod('foo', fn, fn);
     *
     * Then can be used as any other assertion.
     *
     *     expect(myFoo).to.have.length(3);
     *     expect(myFoo).to.have.length.above(3);
     *
     * @param {Object} ctx object whose method / property is to be overwritten
     * @param {String} name of method / property to overwrite
     * @param {Function} method function that returns a function to be used for name
     * @param {Function} chainingBehavior function that returns a function to be used for property
     * @namespace Utils
     * @name overwriteChainableMethod
     * @api public
     */

    module.exports = function (ctx, name, method, chainingBehavior) {
        var chainableBehavior = ctx.__methods[name];

        var _chainingBehavior = chainableBehavior.chainingBehavior;
        chainableBehavior.chainingBehavior = function () {
            var result = chainingBehavior(_chainingBehavior).call(this);
            return result === undefined ? this : result;
        };

        var _method = chainableBehavior.method;
        chainableBehavior.method = function () {
            var result = method(_method).apply(this, arguments);
            return result === undefined ? this : result;
        };
    };

},{}],26:[function(require,module,exports){
    /*!
     * Chai - overwriteMethod utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### overwriteMethod (ctx, name, fn)
     *
     * Overwites an already existing method and provides
     * access to previous function. Must return function
     * to be used for name.
     *
     *     utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
 *       return function (str) {
 *         var obj = utils.flag(this, 'object');
 *         if (obj instanceof Foo) {
 *           new chai.Assertion(obj.value).to.equal(str);
 *         } else {
 *           _super.apply(this, arguments);
 *         }
 *       }
 *     });
     *
     * Can also be accessed directly from `chai.Assertion`.
     *
     *     chai.Assertion.overwriteMethod('foo', fn);
     *
     * Then can be used as any other assertion.
     *
     *     expect(myFoo).to.equal('bar');
     *
     * @param {Object} ctx object whose method is to be overwritten
     * @param {String} name of method to overwrite
     * @param {Function} method function that returns a function to be used for name
     * @namespace Utils
     * @name overwriteMethod
     * @api public
     */

    module.exports = function (ctx, name, method) {
        var _method = ctx[name]
            , _super = function () { return this; };

        if (_method && 'function' === typeof _method)
            _super = _method;

        ctx[name] = function () {
            var result = method(_super).apply(this, arguments);
            return result === undefined ? this : result;
        }
    };

},{}],27:[function(require,module,exports){
    /*!
     * Chai - overwriteProperty utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### overwriteProperty (ctx, name, fn)
     *
     * Overwites an already existing property getter and provides
     * access to previous value. Must return function to use as getter.
     *
     *     utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
 *       return function () {
 *         var obj = utils.flag(this, 'object');
 *         if (obj instanceof Foo) {
 *           new chai.Assertion(obj.name).to.equal('bar');
 *         } else {
 *           _super.call(this);
 *         }
 *       }
 *     });
     *
     *
     * Can also be accessed directly from `chai.Assertion`.
     *
     *     chai.Assertion.overwriteProperty('foo', fn);
     *
     * Then can be used as any other assertion.
     *
     *     expect(myFoo).to.be.ok;
     *
     * @param {Object} ctx object whose property is to be overwritten
     * @param {String} name of property to overwrite
     * @param {Function} getter function that returns a getter function to be used for name
     * @namespace Utils
     * @name overwriteProperty
     * @api public
     */

    module.exports = function (ctx, name, getter) {
        var _get = Object.getOwnPropertyDescriptor(ctx, name)
            , _super = function () {};

        if (_get && 'function' === typeof _get.get)
            _super = _get.get

        Object.defineProperty(ctx, name,
            { get: function () {
                var result = getter(_super).call(this);
                return result === undefined ? this : result;
            }
                , configurable: true
            });
    };

},{}],28:[function(require,module,exports){
    /*!
     * Chai - test utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Module dependancies
     */

    var flag = require('./flag');

    /**
     * # test(object, expression)
     *
     * Test and object for expression.
     *
     * @param {Object} object (constructed Assertion)
     * @param {Arguments} chai.Assertion.prototype.assert arguments
     * @namespace Utils
     * @name test
     */

    module.exports = function (obj, args) {
        var negate = flag(obj, 'negate')
            , expr = args[0];
        return negate ? !expr : expr;
    };

},{"./flag":13}],29:[function(require,module,exports){
    /*!
     * Chai - transferFlags utility
     * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /**
     * ### transferFlags(assertion, object, includeAll = true)
     *
     * Transfer all the flags for `assertion` to `object`. If
     * `includeAll` is set to `false`, then the base Chai
     * assertion flags (namely `object`, `ssfi`, and `message`)
     * will not be transferred.
     *
     *
     *     var newAssertion = new Assertion();
     *     utils.transferFlags(assertion, newAssertion);
     *
     *     var anotherAsseriton = new Assertion(myObj);
     *     utils.transferFlags(assertion, anotherAssertion, false);
     *
     * @param {Assertion} assertion the assertion to transfer the flags from
     * @param {Object} object the object to transfer the flags to; usually a new assertion
     * @param {Boolean} includeAll
     * @namespace Utils
     * @name transferFlags
     * @api private
     */

    module.exports = function (assertion, object, includeAll) {
        var flags = assertion.__flags || (assertion.__flags = Object.create(null));

        if (!object.__flags) {
            object.__flags = Object.create(null);
        }

        includeAll = arguments.length === 3 ? includeAll : true;

        for (var flag in flags) {
            if (includeAll ||
                (flag !== 'object' && flag !== 'ssfi' && flag != 'message')) {
                object.__flags[flag] = flags[flag];
            }
        }
    };

},{}],30:[function(require,module,exports){
    /*!
     * assertion-error
     * Copyright(c) 2013 Jake Luer <jake@qualiancy.com>
     * MIT Licensed
     */

    /*!
     * Return a function that will copy properties from
     * one object to another excluding any originally
     * listed. Returned function will create a new `{}`.
     *
     * @param {String} excluded properties ...
     * @return {Function}
     */

    function exclude () {
        var excludes = [].slice.call(arguments);

        function excludeProps (res, obj) {
            Object.keys(obj).forEach(function (key) {
                if (!~excludes.indexOf(key)) res[key] = obj[key];
            });
        }

        return function extendExclude () {
            var args = [].slice.call(arguments)
                , i = 0
                , res = {};

            for (; i < args.length; i++) {
                excludeProps(res, args[i]);
            }

            return res;
        };
    };

    /*!
     * Primary Exports
     */

    module.exports = AssertionError;

    /**
     * ### AssertionError
     *
     * An extension of the JavaScript `Error` constructor for
     * assertion and validation scenarios.
     *
     * @param {String} message
     * @param {Object} properties to include (optional)
     * @param {callee} start stack function (optional)
     */

    function AssertionError (message, _props, ssf) {
        var extend = exclude('name', 'message', 'stack', 'constructor', 'toJSON')
            , props = extend(_props || {});

        // default values
        this.message = message || 'Unspecified AssertionError';
        this.showDiff = false;

        // copy from properties
        for (var key in props) {
            this[key] = props[key];
        }

        // capture stack trace
        ssf = ssf || arguments.callee;
        if (ssf && Error.captureStackTrace) {
            Error.captureStackTrace(this, ssf);
        } else {
            this.stack = new Error().stack;
        }
    }

    /*!
     * Inherit from Error.prototype
     */

    AssertionError.prototype = Object.create(Error.prototype);

    /*!
     * Statically set name
     */

    AssertionError.prototype.name = 'AssertionError';

    /*!
     * Ensure correct constructor
     */

    AssertionError.prototype.constructor = AssertionError;

    /**
     * Allow errors to be converted to JSON for static transfer.
     *
     * @param {Boolean} include stack (default: `true`)
     * @return {Object} object that can be `JSON.stringify`
     */

    AssertionError.prototype.toJSON = function (stack) {
        var extend = exclude('constructor', 'toJSON', 'stack')
            , props = extend({ name: this.name }, this);

        // include stack if exists and not turned off
        if (false !== stack && this.stack) {
            props.stack = this.stack;
        }

        return props;
    };

},{}],31:[function(require,module,exports){
    module.exports = require('./lib/eql');

},{"./lib/eql":32}],32:[function(require,module,exports){
    /*!
     * deep-eql
     * Copyright(c) 2013 Jake Luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Module dependencies
     */

    var type = require('type-detect');

    /*!
     * Buffer.isBuffer browser shim
     */

    var Buffer;
    try { Buffer = require('buffer').Buffer; }
    catch(ex) {
        Buffer = {};
        Buffer.isBuffer = function() { return false; }
    }

    /*!
     * Primary Export
     */

    module.exports = deepEqual;

    /**
     * Assert super-strict (egal) equality between
     * two objects of any type.
     *
     * @param {Mixed} a
     * @param {Mixed} b
     * @param {Array} memoised (optional)
     * @return {Boolean} equal match
     */

    function deepEqual(a, b, m) {
        if (sameValue(a, b)) {
            return true;
        } else if ('date' === type(a)) {
            return dateEqual(a, b);
        } else if ('regexp' === type(a)) {
            return regexpEqual(a, b);
        } else if (Buffer.isBuffer(a)) {
            return bufferEqual(a, b);
        } else if ('arguments' === type(a)) {
            return argumentsEqual(a, b, m);
        } else if (!typeEqual(a, b)) {
            return false;
        } else if (('object' !== type(a) && 'object' !== type(b))
            && ('array' !== type(a) && 'array' !== type(b))) {
            return sameValue(a, b);
        } else {
            return objectEqual(a, b, m);
        }
    }

    /*!
     * Strict (egal) equality test. Ensures that NaN always
     * equals NaN and `-0` does not equal `+0`.
     *
     * @param {Mixed} a
     * @param {Mixed} b
     * @return {Boolean} equal match
     */

    function sameValue(a, b) {
        if (a === b) return a !== 0 || 1 / a === 1 / b;
        return a !== a && b !== b;
    }

    /*!
     * Compare the types of two given objects and
     * return if they are equal. Note that an Array
     * has a type of `array` (not `object`) and arguments
     * have a type of `arguments` (not `array`/`object`).
     *
     * @param {Mixed} a
     * @param {Mixed} b
     * @return {Boolean} result
     */

    function typeEqual(a, b) {
        return type(a) === type(b);
    }

    /*!
     * Compare two Date objects by asserting that
     * the time values are equal using `saveValue`.
     *
     * @param {Date} a
     * @param {Date} b
     * @return {Boolean} result
     */

    function dateEqual(a, b) {
        if ('date' !== type(b)) return false;
        return sameValue(a.getTime(), b.getTime());
    }

    /*!
     * Compare two regular expressions by converting them
     * to string and checking for `sameValue`.
     *
     * @param {RegExp} a
     * @param {RegExp} b
     * @return {Boolean} result
     */

    function regexpEqual(a, b) {
        if ('regexp' !== type(b)) return false;
        return sameValue(a.toString(), b.toString());
    }

    /*!
     * Assert deep equality of two `arguments` objects.
     * Unfortunately, these must be sliced to arrays
     * prior to test to ensure no bad behavior.
     *
     * @param {Arguments} a
     * @param {Arguments} b
     * @param {Array} memoize (optional)
     * @return {Boolean} result
     */

    function argumentsEqual(a, b, m) {
        if ('arguments' !== type(b)) return false;
        a = [].slice.call(a);
        b = [].slice.call(b);
        return deepEqual(a, b, m);
    }

    /*!
     * Get enumerable properties of a given object.
     *
     * @param {Object} a
     * @return {Array} property names
     */

    function enumerable(a) {
        var res = [];
        for (var key in a) res.push(key);
        return res;
    }

    /*!
     * Simple equality for flat iterable objects
     * such as Arrays or Node.js buffers.
     *
     * @param {Iterable} a
     * @param {Iterable} b
     * @return {Boolean} result
     */

    function iterableEqual(a, b) {
        if (a.length !==  b.length) return false;

        var i = 0;
        var match = true;

        for (; i < a.length; i++) {
            if (a[i] !== b[i]) {
                match = false;
                break;
            }
        }

        return match;
    }

    /*!
     * Extension to `iterableEqual` specifically
     * for Node.js Buffers.
     *
     * @param {Buffer} a
     * @param {Mixed} b
     * @return {Boolean} result
     */

    function bufferEqual(a, b) {
        if (!Buffer.isBuffer(b)) return false;
        return iterableEqual(a, b);
    }

    /*!
     * Block for `objectEqual` ensuring non-existing
     * values don't get in.
     *
     * @param {Mixed} object
     * @return {Boolean} result
     */

    function isValue(a) {
        return a !== null && a !== undefined;
    }

    /*!
     * Recursively check the equality of two objects.
     * Once basic sameness has been established it will
     * defer to `deepEqual` for each enumerable key
     * in the object.
     *
     * @param {Mixed} a
     * @param {Mixed} b
     * @return {Boolean} result
     */

    function objectEqual(a, b, m) {
        if (!isValue(a) || !isValue(b)) {
            return false;
        }

        if (a.prototype !== b.prototype) {
            return false;
        }

        var i;
        if (m) {
            for (i = 0; i < m.length; i++) {
                if ((m[i][0] === a && m[i][1] === b)
                    ||  (m[i][0] === b && m[i][1] === a)) {
                    return true;
                }
            }
        } else {
            m = [];
        }

        try {
            var ka = enumerable(a);
            var kb = enumerable(b);
        } catch (ex) {
            return false;
        }

        ka.sort();
        kb.sort();

        if (!iterableEqual(ka, kb)) {
            return false;
        }

        m.push([ a, b ]);

        var key;
        for (i = ka.length - 1; i >= 0; i--) {
            key = ka[i];
            if (!deepEqual(a[key], b[key], m)) {
                return false;
            }
        }

        return true;
    }

},{"buffer":undefined,"type-detect":33}],33:[function(require,module,exports){
    module.exports = require('./lib/type');

},{"./lib/type":34}],34:[function(require,module,exports){
    /*!
     * type-detect
     * Copyright(c) 2013 jake luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Primary Exports
     */

    var exports = module.exports = getType;

    /*!
     * Detectable javascript natives
     */

    var natives = {
        '[object Array]': 'array'
        , '[object RegExp]': 'regexp'
        , '[object Function]': 'function'
        , '[object Arguments]': 'arguments'
        , '[object Date]': 'date'
    };

    /**
     * ### typeOf (obj)
     *
     * Use several different techniques to determine
     * the type of object being tested.
     *
     *
     * @param {Mixed} object
     * @return {String} object type
     * @api public
     */

    function getType (obj) {
        var str = Object.prototype.toString.call(obj);
        if (natives[str]) return natives[str];
        if (obj === null) return 'null';
        if (obj === undefined) return 'undefined';
        if (obj === Object(obj)) return 'object';
        return typeof obj;
    }

    exports.Library = Library;

    /**
     * ### Library
     *
     * Create a repository for custom type detection.
     *
     * ```js
     * var lib = new type.Library;
     * ```
     *
     */

    function Library () {
        this.tests = {};
    }

    /**
     * #### .of (obj)
     *
     * Expose replacement `typeof` detection to the library.
     *
     * ```js
     * if ('string' === lib.of('hello world')) {
 *   // ...
 * }
     * ```
     *
     * @param {Mixed} object to test
     * @return {String} type
     */

    Library.prototype.of = getType;

    /**
     * #### .define (type, test)
     *
     * Add a test to for the `.test()` assertion.
     *
     * Can be defined as a regular expression:
     *
     * ```js
     * lib.define('int', /^[0-9]+$/);
     * ```
     *
     * ... or as a function:
     *
     * ```js
     * lib.define('bln', function (obj) {
 *   if ('boolean' === lib.of(obj)) return true;
 *   var blns = [ 'yes', 'no', 'true', 'false', 1, 0 ];
 *   if ('string' === lib.of(obj)) obj = obj.toLowerCase();
 *   return !! ~blns.indexOf(obj);
 * });
     * ```
     *
     * @param {String} type
     * @param {RegExp|Function} test
     * @api public
     */

    Library.prototype.define = function (type, test) {
        if (arguments.length === 1) return this.tests[type];
        this.tests[type] = test;
        return this;
    };

    /**
     * #### .test (obj, test)
     *
     * Assert that an object is of type. Will first
     * check natives, and if that does not pass it will
     * use the user defined custom tests.
     *
     * ```js
     * assert(lib.test('1', 'int'));
     * assert(lib.test('yes', 'bln'));
     * ```
     *
     * @param {Mixed} object
     * @param {String} type
     * @return {Boolean} result
     * @api public
     */

    Library.prototype.test = function (obj, type) {
        if (type === getType(obj)) return true;
        var test = this.tests[type];

        if (test && 'regexp' === getType(test)) {
            return test.test(obj);
        } else if (test && 'function' === getType(test)) {
            return test(obj);
        } else {
            throw new ReferenceError('Type test "' + type + '" not defined or invalid.');
        }
    };

},{}],35:[function(require,module,exports){
    arguments[4][33][0].apply(exports,arguments)
},{"./lib/type":36,"dup":33}],36:[function(require,module,exports){
    /*!
     * type-detect
     * Copyright(c) 2013 jake luer <jake@alogicalparadox.com>
     * MIT Licensed
     */

    /*!
     * Primary Exports
     */

    var exports = module.exports = getType;

    /**
     * ### typeOf (obj)
     *
     * Use several different techniques to determine
     * the type of object being tested.
     *
     *
     * @param {Mixed} object
     * @return {String} object type
     * @api public
     */
    var objectTypeRegexp = /^\[object (.*)\]$/;

    function getType(obj) {
        var type = Object.prototype.toString.call(obj).match(objectTypeRegexp)[1].toLowerCase();
        // Let "new String('')" return 'object'
        if (typeof Promise === 'function' && obj instanceof Promise) return 'promise';
        // PhantomJS has type "DOMWindow" for null
        if (obj === null) return 'null';
        // PhantomJS has type "DOMWindow" for undefined
        if (obj === undefined) return 'undefined';
        return type;
    }

    exports.Library = Library;

    /**
     * ### Library
     *
     * Create a repository for custom type detection.
     *
     * ```js
     * var lib = new type.Library;
     * ```
     *
     */

    function Library() {
        if (!(this instanceof Library)) return new Library();
        this.tests = {};
    }

    /**
     * #### .of (obj)
     *
     * Expose replacement `typeof` detection to the library.
     *
     * ```js
     * if ('string' === lib.of('hello world')) {
 *   // ...
 * }
     * ```
     *
     * @param {Mixed} object to test
     * @return {String} type
     */

    Library.prototype.of = getType;

    /**
     * #### .define (type, test)
     *
     * Add a test to for the `.test()` assertion.
     *
     * Can be defined as a regular expression:
     *
     * ```js
     * lib.define('int', /^[0-9]+$/);
     * ```
     *
     * ... or as a function:
     *
     * ```js
     * lib.define('bln', function (obj) {
 *   if ('boolean' === lib.of(obj)) return true;
 *   var blns = [ 'yes', 'no', 'true', 'false', 1, 0 ];
 *   if ('string' === lib.of(obj)) obj = obj.toLowerCase();
 *   return !! ~blns.indexOf(obj);
 * });
     * ```
     *
     * @param {String} type
     * @param {RegExp|Function} test
     * @api public
     */

    Library.prototype.define = function(type, test) {
        if (arguments.length === 1) return this.tests[type];
        this.tests[type] = test;
        return this;
    };

    /**
     * #### .test (obj, test)
     *
     * Assert that an object is of type. Will first
     * check natives, and if that does not pass it will
     * use the user defined custom tests.
     *
     * ```js
     * assert(lib.test('1', 'int'));
     * assert(lib.test('yes', 'bln'));
     * ```
     *
     * @param {Mixed} object
     * @param {String} type
     * @return {Boolean} result
     * @api public
     */

    Library.prototype.test = function(obj, type) {
        if (type === getType(obj)) return true;
        var test = this.tests[type];

        if (test && 'regexp' === getType(test)) {
            return test.test(obj);
        } else if (test && 'function' === getType(test)) {
            return test(obj);
        } else {
            throw new ReferenceError('Type test "' + type + '" not defined or invalid.');
        }
    };

},{}]},{},[1])(1)
});